Linear, linear, linear

[Shurrikhan]

I haven't played WoW since end of Legion so I have no idea what the new expansion dungeons are like.

Yes, they had stopped making the multi-path dungeons where you had true options on how to complete the dungeon. The closest you would get would be the dungeons that were set up in wings but you still have to clear every wing before you could proceed to the final boss.

That... is a multi-path dungeon. If you can go 1234, 2314, 3214, etc.... that's... already multiple paths available. And that's all WoW has ever had within Vanilla, either, so there's been no "stop" there; it's the same capacity (though expanded, in some cases). And well beyond even 1.x outside of old Totorak (3 exits, with the furthest one giving more rewards, but increasingly risking death to the gasses inside [timer mechanic]).

Unless you're looking for a dungeon that is itself multiple dungeons, so that you only complete some third of it per run... how would that not fit the descriptor?

(Frequently, the individual mobs outside a boss foreshadow the mechanics of that boss, while the bosses leading up to the final may foreshadow the mechanics of the final boss. As such, I'm fine with the final boss truly being the final boss in the interest of the mechanics feeling thematically approached and less seemingly arbitrary than they otherwise would be.)

Some Dragonflight dungeons, for context:
Nokhud Offensive (any order, save for final boss)

Brackenhide Hollow (first and final bosses set order, multiple paths through all the mid-content)