Do I need full version of Kontakt?

I've been using Kontakt Player for years (with many instruments & libraries, free & paid), and I'm happy with it.
I'm not a professional, I play music as a hobby.

I'm aware that some instruments are not available with Kontakt Player, but only with full Kontakt, right?
First thing, I don't quite understand why. Is this a technical issue?

It seems that Kontakt allows developing your own instruments, but I'm not interested (I mean, it is interesting obviously, but I just have no time for this).

Finally, I don't quite understand what I'd get by purchasing Kontakt, versus using just Kontakt Player.
Would I only get the ability to use some more libraries, not available with Kontakt Player?
As far as I understand, Kontakt comes with several instruments & libraries, as described here, but I think I already own most of them.

So do you think I might need the full version of Kontakt?
In other words: is it worth paying €399 just for getting access to more libraries?
Thanks for your help!

 

No, it's a licensing issue. Kontakt Player licensing costs the developer money, and some developers decide not to go along with it depending on product.

Yes.

You don't have to spend €399, because as owner of KP libraries you're eligible to crossgrade to full version of Kontakt at a reduced price of 249€.

 

Depending on how you potentially spend your money, the full version of Kontakt could work out cheaper.

 

You mean, Kontakt may give you access to cheaper or free instruments?

 

Exactly

 

I got full Kontakt as part of the upgrade from Select during the Black Friday sale. For the price of just the Kontakt upgrade, you get tons of instruments and can save a lot of money, if you can wait for one of the big sales.