Indeed. It doesn't even have to be anything specific. Once you start trying to expand, extend and adapt an existing piece of software to cover a multitude of different directions and developments, every new tacked-on or fudged piece of functionality is yet another bit of complexity that has to be taken into account when you're trying to add the next thing. It can build up to a huge amount of inertia over time that makes it exponentially harder to incorporate new features.
What was particularly interesting here was that this whole thing emerged over the Supernatural Gifts in Theros. Somehow, I forget how, people knew about them well in advance, and they were discussed, and Beyond people said they wouldn't be implemented initially, but they were working on a system that would allow them to implement them, and that system would be finished within (at that time) three months. Then three months passed, but the Beyond people said, well, in order to get the stuff for Tasha's working (then a UA), we'll have to get this working, so it'll be soon! Then we kept getting "just wait for Tasha's, it'll be then". Then Tasha's came out and they still hadn't implemented Supernatural Gifts (or Piety, IIRC, which they also said would come).
Now it's late 2022, and whilst they implemented Tasha's, they still didn't do Supernatural Gifts, nor Dark Gifts from Ravenloft, and so on. And now it looks like they're not even tracking that. So they'd promised the same tech which would make Tasha's possible would work for these, but apparently not? They specifically said the tech for Tasha's would let them arbitrarily add any new traits (in the general sense) to a PC. But I guess that didn't happen.
It's pretty bad, frankly.
It was suggested to them that they just make all the Gifts into Feats (which is doable even using their own systems), but they repeatedly refused to do so on the specific grounds that they'd
soon be available via a better system.