a,) Platform scope creep:
There is a difference between virtuous scope creep and wasteful scope creep. I would ask, is the scope going to make a developer workflow simpler? Whose job does this additional scope make easier? What customer or stakeholder is asking for it, and why?
These can all be valuable and useful things to invest in. If you have an identified customer and a clear path to ROI, you can then make a business case to make it allowed scope.
The answer, however, may be a.) it doesn't actually do much impact or b.) it could matter, but there are some even better investments that come ahead of those. In those cases, the answer isn't no, but it's "later", when other business conditions dictate that the scope that someone wants can be added within whatever budget envelope you have.