when you're ridiculously over reductive about game mechanics its surprising how few games don't fall into "wash rinse repeat" territory.
It's not over reductive, it's literally Lego gameplay. The combat boils down to mashing one button, the puzzles rarely get more complex than "use this character's ability on this spot", and instant respawning after death means there's little skill required. It's all very simplistic stuff and it's not hard to see why it wouldn't appeal to older gamers.