Now this is something new ive not seen Bruce criticised for before. The reason is out of all those teams you've suggested that don't really change their style of play is because they are by far the best teams in their divisions, they don't need to change as they should win most weeks regardless. Our division is a lot more competitive. If you also look at when these teams meet in the champions league, when one side doesn't change systems the results can be chaotic. Roma had a chance of a final, didn't change the back 3 high press got thumped off Liverpool, psg 4 up at barca set up as normal lost 6 1, you could even say wolves come to villa Park without changing any of the system and got a hammering.
Sometimes you just need to set up differently in order to win a game.