So it has been a long time since I encountered a user interface that make stupid assumptions about their users but a few weeks ago my bank managed to do so.
I had just downloaded my bank's iOS app in order to deposit a check I've received. As part of the workflow I have to enter the amount on the check and my phone brings up a nice numeric only keyboard. Since I've set my iPhone to display dates and numbers the Swedish way the numeric keyboard only has a comma and no dot as we in Sweden (and a lot of other countries) use decimal commas rather than decimal dots and then only space rather than a comma to separate thousands for readability.
Anyway, using this keyboard I enter 123,45 and get an error from the app - invalid number. I had to open a note, enter "123.45" which I copied and then pasted in my bank app. Stupid.
If there is some secret way to switch away from the numeric only keyboard it is well hidden so regardless this is a bad app making stupid assumptions about how users use the app.