1% of the people that want this feature are surely thrilled. It is a cool feature. The other 99% of us are looking at this like a potential land mine that will show up unsuspectingly when trying to refactor old code, or migrating from postgres.
Generated/computed columns are a fairly common RDBMS feature; MySQL has it since 5.7; SQL Server, Oracle, and DB2 have them. So, Postgres having them makes migrating into Postgres easier and migrating out no more difficult except maybe if you are migrating to SQLite or a nonrelational store.
I doubt 99% of the community is so humorously pessimistic. This functionality can be easily replicated in several databases (with triggers and the like). Generated columns l make a common pattern simpler and more explicit. Maybe it’s not a useful feature for everyone but it’s certainly not some instant tech debt like you’re implying.
