Hi, Friendly_Ghost
My name is Marina, and I’m a mapper on the OSM team at Lyft. 
The barrier:keypad tag was recommended for use in a slack discussion with the OSM community: https://osmus.slack.com/archives/C2VJAJCS0/p1681734702769439  
Additionally, we are following this proposal - https://wiki.openstreetmap.org/w/index.php?oldid=840159#Combinations_/_Subtags  
The usage of this tag has increased because we have initiated a new project to incorporate it; more details are available here -  https://github.com/Test-DCT/OSM-LYFT-DCT/issues/29 
Thank you for your interest in our edits. I am happy to answer any questions you may have.
Best regards,
   Marina
