Also, often times I found myself debugging NDK and it took a lot of time because I did not write it.

You and other devs who wrote the libs and sdk-s have had the advantage of using your own stuff much more confidently and whenever there's a subtle bug you can just quickly fix.

This advantage is diminishing as nostr matures.

One other thing: Specialty clients get less attention because media is after Twitter vs Bluesky vs Nostr for now. This will also change rapidly soon.

Once there's more attention on other apps, there will be more feedback and so better apps.