It took me quite a whiel to accept and understand that there are also large wrist existing, but I still wonder if the watch world is also simply
thinking that big is better, as it is more visible.
Anyway, I would say that the 3738 at the current size is perfect and one of the few enlargements that worked.
Just tried today an WG 5196 on and it looked big.
The plane, simple design makes it look big with a size of just 37 mm!
But your thought is wright: various sizes of a model to feed various needs.
But than: production numbers would go through the roof.
Regards
Moritz