Ultimately, the world is not a grid. So while grids may be great for pure strategy games like XCom (and I really enjoyed XCom, not knocking it at all), I think a lot of people would say that for more story-focused games like RPGs, they break the immersion. Thus, BG3 (which I’m also really enjoying) does not use one. Neither do any of the party-based RPGs that I can think of off the top of my head. For me personally, it depends on the game. I am perfectly happy without one in BG3. But I enjoyed having one for XCom, and more recently for Warhammer 40k Mechanicus. I would offer that as a suggestion if you are looking for a gridded turn-based strategy game.
Still playing BG3. About 120 hours in, still my first playthrough, but I think I’m getting close to the end. Wouldn’t be surprised if it takes me another 15-20 hours to get there though. After that I need to decide if I want to play through again with different characters/choices, or do something else first (recently got Tiny Tina in a bundle and looking forward to playing that).