yeah sizing is all wonky with some items but I also think real life just has so much more differently sized objects that are all same basic sizes in sims that you can't get it right even if you tried
like for example you have 2 tile wide couple bed in sims but really it could be anywhere between 120 cm - 2m something wide (not even going to guess biggest bed size in america land its probably something insane)
and obviously that is one rather big difference in real life
but in sims we just be pretending its all the same lmao
i think the same goes for all possible objects there are bigger and smaller versions of them and its just whatever version the person who made object liked the best