Agreed.
However, in some states, such as California, mail-in voting has become the default.
What's used to verify identity and integrity? Your signature from your voter's affidavit of registration, a signature from any past voter form, or literally an "X"[1]. Your signature doesn't even need to match, it just must have "similar characteristics". You can print your name or sign in cursive, you can even just use initials. They're all accepted.
We're firmly on the "honor system".
Pair that with lack of voter ID laws, and we have a system that's designed to be untrustworthy.
Yes, I agree, a state issued ID should be free...
[1] https://codes.findlaw.com/ca/elections-code/elec-sect-3019/