I'm a huge fan of views to serve as the v1 solution for problems before we need to optimize our approach, and this is the main thing that serves as a blocker in those discussions. If only we were able to have v2 of the approach be an IVM-view, we could leverage them much more widely.
Agreed big disappointment that "incremental view maintenance" is taking so long to get into the core - despite several IVM extensions. For me this is by far the most important capability missing from Postgres.
In my understanding it was a timing issue with the UUIDv7 RFC not being finalized before the Postgres 17 feature freeze in early April. Shouldn't be an issue to get this in for Postgres 18, I think.
My assumption is that because you can easily do this through software when using UUID and probably a lot do it like this, the pressure of supporting it, is a lot lower than expected.