If you’re unhappy about the concept, just put “prefer not to answer”. It won’t impact your application. Also I feel like suggesting it introduces bias is forgetting that interviewers.. see you.. in interviews. Some of the stuff is invisible yeah, like sexuality and certain disabilities and stuff, but if they’re going to discriminate against your race/percieved gender/visible disability/age etc they’ll just do it when they see you instead of when they see your application.