Is the roleplay aspect of D&D gone, replaced by optimization?

[Amnestic]

Reminds me of our first attempt at running Curse of Strahd. I had a cool concept for a vistani vampire spawn on a quest for revenge against Strahd for ruining his life, and the other two PCs were a tortle and dragonborn who were random murderhobos with very silly RP. I felt like my character was heavily clashing with the tone of the party, and it frustrated me.

I later ran the exact same character in a solo run of Curse of Strahd, and it's one of the best campaigns I've ever had.

Ideally that sort of thing should be sorted out in a session 0 with the DM where you discuss character ideas, what sort of tone/genre the game will have and the like. DMs and players should be upfront with each other so that they're all singing from the same hymn sheet when it gets to session 1 time.