[suzumer]

My post is mostly referring to children, who even with step by step instructions, may have some difficulty. Look at the stickers on this space shuttle: https://www.lego.com/cdn/cs/set/assets/blt6d09e0ada535ae04/1... , which require fairly precise alignment. Or the tiles on the roof of rivendell: https://www.lego.com/cdn/cs/set/assets/blt0a0c82506f8bd960/1... , and then there's topic of endurance with regards to larger sets.

That being said, I actually revise my thesis. Looking back, Lego used to have age ranges listed: https://images.brickset.com/sets/large/7893-1.jpg , however, it appears all sets now just list a single age with a plus sign. Thus it seems Lego has actually shifted more towards the age simply being capability, with the 18+ designation being the outlier.

[pimlottc]

> Looking back, Lego used to have age ranges listed: https://images.brickset.com/sets/large/7893-1.jpg

As an aside, that set (from 2006) is a good counterexample to the oft-heard complaint that "sets these days have too many custom parts"...