That said, I don't really understand the difference between visual combats and random encounters. With exceptions for story/quests reasons, most games I can think of have "combats for combats".
(to name a few in BG3 : the minotaurs, the spiders+ettercap, the gnolls after the bridge, the mephits).
Random encounters feel like trash filler to me, too, in the games I have played. Boss fights are designed and often have mechanics that are interesting, so I like those. They also aren’t stopping me from doing something I want to do (traveling/working on a quest or resting). That is one of the things I love about BG3: no trash mobs or fetch quests. Everything in the game is fun and interesting to me!