Pathfinder 2e is definitely more complicated than DND 5e, but in return you get a much more interesting, expressive game, in my opinion. When people say it’s cleanly designed they are normally comparing it to pathfinder 1e, which is a labyrinth of bizarre rules, pointless edge cases and overly crunchy rolls.
Dungeons & Dragons will release its 2024 ruleset under a Creative Commons licence (www.dicebreaker.com)