If you make a piece of software, and people are required to use that piece of software in order to, say, pay for their housing or groceries or pay back a loan, you are on the hook to make sure that software works for _every single person_ who needs to use it.
All of them.
Every screen reader user. Every person with muscle issues who can't use a mouse. Everyone who doesn't speak English. Everyone with three first names, or no last name. Everyone who is Irish or Jewish and has a ' in their name. Everyone with slow internet.
EVERY person.
"Oh we don't have the resources to do that!" Great. Then you don't have the resources to make and sell that kind of software. Pack up and go home.