As someone who used QLDB as a WORM audited log for a financial system, and ran AWS classes that used Cloud9, they do depricate.

Not many, and not often but it is annoying.

A bit more polish for a public facing artifact from a multi-billion dollar org with armies of engineers and big token budgets.

The Copilot CLI https://aws.github.io/copilot-cli/ you can feel polish and pride of the team that built this, as an example.

Except for things they make: forever maintained forever.