Just a random thought (lived both in the US and in the EU): could it be that US ovens are more often gas ovens while in the EU it's mostly electric? (might be easier to get higher temperatures with gas).

Couldn't find statistics on this with a quick search...

It's the opposite... my oven in the US doesn't have the cleaning thing, turns out it's because it's gas only. The gas stovetop + electric oven version of this model has it. Seems to be a thing even with other manufacturers and models.

I’ve lived in the US and EU too. My experience was we have fan assisted ovens in the EU whereas ones I saw in the US had a top and bottom element with no fan assist.

Fan assisted ovens are also called "convection ovens." They certainly exist in the US, but I think they are more high end? I personally have one, it also has a self-clean function. The stove part is gas but I think (?) the oven is electric.

Ovens are smaller here typically and you’ll more often than not find the oven and hob (stove) as separate appliances.

I'm in Canada, but I don't think I've ever seen a gas oven. All my ovens have been electric, and nearly all of them had a self-clean option.