European aspect ratios have historically differed from North American.
Not strictly true, North American aspect ratios and plate/film sizes are based on European sizes from Britain, it's continental Europe that differed as they used metric sizes.
7x5" is the only major film/plate format to originate in the US and took the place of half plate and whole plate.
I shoot to suit and fit the format, I like the 2:3 aspect ratio but have hardly used it in recent years, I do have a 6x9 RF back for my Wista and 2 or 3 6x9 SLR's (pre WWII) as well as an Ensigh 820. The 3:4 format is quite nice as well, I have a few 9x12 cameras it's a touch different to 5x4 and 10x8.
In practice I regularly shoot 1:1 (TLRs), 3:4, 4:5 (4x5 & 10x8), 6x17 and will shortly start with 5:7 with a couple of 7x5 cameras.
Ian