I've noticed there's two versions of D&D players that have been roughly described on the periphery and I've been both in past games.
One is the, I lean into my character's fictional experiences at the table to guide what roles they take, at which point they multiclass, take certain feats, learn particular skills and so on.
The second is, I have a concept of a character that I feel would be fun to play for X reasons, what are the paths they might chart so the sheet embodies that concept.
If I were to play D&D now, I'd trend toward the first compared to the past.
But I've had the experience of having a player who wanted to be Darth Vader in D&D. Our group at the time didn't realize this until a few levels later, when we found it curious their character kept wanting to learn particular feats, acquire magic items that gave abilities that were suspiciously like what a Sith Lord could do, as well as in game kept trying to put together a black ensemble.
It was quite hilarious when we confronted them on it out of the game.
One of the characters I made was a half-orc barbarian/bard, who beat a drum; that was the entire concept. I thought the idea of him was great; he was fun for me to play and it was memorable.
I'm sure there are D&D players who have characteristics from both of these roughly described approaches, to a lesser or greater extent. If you're going to have multiclass exist in some form, it should attempt to be accommodating to those ways of engagement.