I don't recall having seen self serve check in at any hotels I've been to outside Japan.
Only seen them at a few hotels I've been to in Japan (Shinagawa, Ueno, Yokohama, Numazu), and have only used them once for check in. Staff have been happy to do it themselves otherwise.
Have used the kisoks to check out.
During a stopover in London many years ago, I was at a Sainsbury's when someone joined the check out line and shortly started screaming about there being "no service" because they chose to enter the self serve line.
A few weeks ago the morning after the CrowdStrike IT crash, the only check outs operating at work were 2 of the self serves. The full service lanes were in the middle of rebooting as the fix was being applied. A customer refused to use them, even though staff offered to do it for them
They are meant to call people to help on the checkouts when the line is more then "2 deep" (one person being served, one waiting). If there is a 3rd person in line waiting, either the service manager/supervisor isn't paying attention or the people they are calling are refusing/unable to come. (unless every check out was already open or every check out trained staff member in the store was already on one)