You can’t probably blame 100% of that difference on the design standards of US vehicles. But probably a high proportion of them!
Why not compare with the GMC sierra 2500 of whatever year?
Which has resulted in trucks become more useless as actual trucks, since they've evolved into SUVs with a tiny bed you can't fit a sheet of plywood into.
Add in the absolutely stupid design of larger passenger vehicles and you get the current trend.
Approximately nobody wants these cars in Europe! Everyone who wants one and can afford one already owns one, there’s no lack of supply.
This is an incredibly niche product in Europe, so far I’ve seen no evidence that the current state of affairs isn’t perfectly fine.
No need to fix things that aren’t broken, or don’t even look to be trending in that direction.