Limitation for the blind. It is existing now but it won't exist in the future.

It can be solved in the future with bigger adoption and more developments in softwares, apps for disabilities.

Blind people can read through the Braille writing system and they also can hear if they are not deaf. Bitcoin has one method to back up their private key or mnemonic seeds to metal sheets and it can be used for the blind.

The barrier is how companies can build up those products for the blind but still can give them privacy and safety for their private key/ mnemonic seeds. For the blinds, I think mnemonic seeds are best for them.