It's funny because if they tried to replace key locks with fingerprint readers there'd be an immediate lawsuit over accessibility despite far more than 85% of people having usable fingers.
My fingers get cut, scraped, and burned enough during the course of a typical work week that fingerprint readers just don't work for me in general. My fingers are very usable but my fingerprints can sometimes be unusable.
Over a career of working with caustic cleaning chemicals and other stuff, my father's fingerprints are just about entirely gone. The last time he went in for fingerprinting they tried him on the scanner for nearly an hour before making an exception to the "electronic prints only" rule and broke out the ink pad and did it the old fashioned way.
Electronic "fingerprint" readers most commonly analyse the blood vessels under the skin, not traditional finger skin patterns.
You'd exclude most elderly people whose fingerprints have faded away, or people with hands a bit too moist for the print to register, etc.
While I do have mostly usable fingers, fingerprint readers do not like me; my hands are consistently too sweaty
Also fingerprint readers and indoor rock climbing don't go well together. At a job I had I needed to have my fingerprint reprogrammed every week or so because enough had rubbed off during climbing that it was not similar enough.
I have palmar hyperhidrosis as well. What helps is either clinical strength antiperspirant (something like DriClor) or iontophoresis.
DriClor seems to have no effect on me at all. Regular anti-perspirant works better for me.