This was already being done in the CRC more than three decades ago. Departing from the Reformed standards was justified by citing the need to be Reformed and reforming. It did no good to ask what it was they were reforming to, for that kind of question just got drowned out by both the liberal and conservative sides of any discussion on the issues.
No matter what Christian church we are talking about, I believe it does indeed practice a kind of subscriptionism. Even an anti-subscriptionist church has their anti-subscriptionism as a subscriptionist policy. It cannot be avoided. The real problem, as I see it, is how seriously a church takes the subscription that is there. Every church makes a claim to following Biblical authority, but if that is just an empty claim to justify other things then it not so much a matter of whether there is a subscription but rather of what it is they are really subscribing to.
A church that claims to be reforming ought to clearly show that their intended change is grounded firmly in the Bible, and only in the Bible. In the CRC they were accommodating their reading of the Bible to the modern movements of egalitarianism, feminism, inclusivism, evolutionism, and tolerationism (if that's a word at all.) As the church had to reform and modernize in cosmology in the past, so now it had to modenize in cultural ethics and science, so it was claimed. They were conforming to temporal givens, and calling it a reforming effort.
That was thirty years or more ago. But we see the same things still going on in different ways.
When I see a minister on the pulpit proclaiming his own unauthorized though popular views as Biblical doctrine, and his session approving of it, then it is a clear enough indication to me that the leadership of that church does not know what doctrine is. If they cannot tell the difference, then there is a real problem with what they believe they are commissioned by Christ to represent: Christ's gospel; or their own personal convictions. If they cannot tell the difference, then how well do they know doctrine at all?
We do indeed see in our day a plethora of prophets who feel called to minister their church offices to propagate their own personal convictions as necessary unifying precommitments to understanding the Bible. In the face of that, they see not only the confessional standards as subjectively interpreted, but even moreso the Bible. It all seems to depend on how you read them, it seems. So we have so many new apostles with new teachings, teachings which they merely read into the historical writings of the church fathers. People have made not only Calvin, but even Anselm into modern-day presuppositionalists, for example, in order to justify their newnesses with some historical backdrop. All three millennial views make claims on an early church precedent. And for what reason? So they can claim these unnecessary things as necessary, claiming to stand on some grounding of some sort. But this really only indicates what they are really subscribing to, what they are willing to subject even the Bible to. It simply does no good to counter Dispensationalism, which relies heavily upon its eschatological precommitments, with an anti-Dispensational heavy reliance upon another temporal eschatological precommitment. How does that help at all? But we answer their prophets by raising our own; we answer their apostles with our own apostles. And my question is: what is really being subscribed to here? Is this authority from man or from God?
In the PCA and the OPC there are membership vows expected from every member. It holds them to the standards of Biblical faith as summarized in the WCF, WLC, and the WSC. This, then, holds the teaching elders in these denominations to that same standard, for no teaching elder may lead any of his congregation to deny that to which the members have made their vows. So when a denomination allows for certain views on things, such as the creation days for example, then it is not ruling that alternative views may be taught as the teaching of the Bible, but rather that personally holding this or that view does not violate the standards. I can hold to, say, the Framework Hypothesis, and not be excluded from eligibility for office on that account. But if I teach it as the Bible's teaching on creation, then the FH is only the indicator, but not the issue itself, which disqualifies me from holding an office in the church. I am not qualified because I don't know the limits imposed upon me by the office to represent only Christ, and not myself. In equating the two I show that I am ready and willing to compromise Christ in order to raise my own convictions above the level of personal conviction to the status of Biblical doctrine. I have broken with the subscriptional expectations of the church. Christ did not commission His elders to teach the FH. No one in the church has made vows of subordination to the FH as a part of the doctrinal standard. So I have no business teaching it. And if I have done this then I have broken with the subscription of the church, whether or not the church has an official specific subscription formula. For the church is automatically subscribed to the Bible as her objective standard.