> I have exceptionally strong feet and I attribute it to these shoes.
It’s probably more because of this:
> But I do walk a lot. […] For example, if something is 20 walking minutes away and public transport takes 15, I walk.
Maybe it's indeed just the walking.
The shoes I wear most other times are oxfords, monks or brogues however.
These kinda lock your foot in place, metatarsal and arch of the foot are not 'exercised' as much because of the rigidity of these shoes.
I do use more feet muscles in my Five Fingers for the simple fact that these shoes allow me to do that.
You can kinda flex your feet and e.g. choose to land only on the metatarsal and feel safe.