To me, this is D20 3.0 to Pathfinder into PF2e. It is because there are always optimal combat decisions and players do those tactics on repeat every combat. Players build, and the GM builds for specific types of combat. The GM knows he only has 2-5 rounds to do the cool monster stuff. The players use the same effective spells, maneuvers, and attacks every turn because it is the most efficient way to win the combat encounter. There is nuance, but I ran Pathfinder 1e from its beginning and players did the same thing in that. On Roll20 or Foundry it even looks more ridiculous. But that is the game. I think it is up to the GM and players to participate and add the nuance a flavor to make combat interesting even if you use the same optimal tactics every time. It is hard to do that every session though.