> Postgres 17.0 has been out for a bit and ...
No. It's been released in September 2024. That's not "quite a bit".
Now as to why people aren't all on 17 and not even on 16 yet, here's an acronym for you: LTS [1]
Debian 11 Bullseye is the current LTS. It came out in 2021.
PostgreSQL doesn't have a long term support policy [1]. They release a new version around this time every year, and support it for about 5 years.
They didn't say "quite a bit" (long time), they said "a bit" (short time).
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