I buy headphones for their drivers and see if there is any difference is sound, turns out there are slight differences.

I would not recommend anyone buying different driver headphones if they are simply looking for the best sound.

Every headphone I've heard is a far cry from even a basic speaker with the most basic sub. Feeling the bass with your body while having true soundstage is the hight of enjoyment for me.

So to answer the question, yes I've found my endgame long ago(any decent speaker with a sub). If I buy anything in the future it is simply to expand a collection and not as an upgrade to anything as I don't see my enjoyment increasing by having better fidelity.