1) I can't image people liking this change. I'm sure Invision is getting a lot of feedback about it and I'm definitely going to add to it.
2) You've been very diplomatic about the situation and I respect that - but I'm afraid you haven't convinced me that by breaking a feature you've made less used alternatives better. That's a wholistic non-sequitur.
3) I can't imagine anyone complaining about a Topic Feed block (what the heck guys, the AS so so much better! The Topic Feed block just takes up space unnecessarily in the Page Editor) LOL I don't think so...
4) I've learned my lesson with custom apps. They work wonderfully until a major software update breaks them. Waste of money and time - most of the time.
tl;dr
There was once a company that got very big and very wealthy, and became a sort of industry standard (Pelco). Until they managed their company according to a very small set of very large clients that they didn't want to lose, and tailored nearly all of their developments around this narrow group of clients. Then they got smashed by competitors, as their features were not very good for most applications, and their vision narrowed and clouded, unable to respond to the needs of the much larger general public.