3e party developers

It troubles me that a lot of 3e party developers or not 100% compatible with cubase

These are some exemple : 64 bit support osx mac ,AI knob support (can,t use Ai knob with fx plugin or instrument) ,
can,t import presets from the instruments or fx plugin into the cubase preset browser ,crashing fx plugin or instrument ,vst 3.5 support.

Today there still 3e party plugins or instruments that are not uptodate this is just wrong.
The 3e party developers that i,am talking about range from well known to small companies.

Is it up to 3e party developers or steinberg or a combinations of working together.

Maybe it,s not so simple as just talking about it but just what to bring it to the public.