I'd want something in the range of
XS 470
Small 480
Medium 490
Large 500
Etc.
That probably allows more casual riders to size down and still keep sufficient stack, for some people to run shorter stems if they prefer that handling, and for people to get high and forwards if they want to race it.
I have ordered a Cima GR but I'm waiting for these three new cheap 57mm frames to mature to order a new frame for my girlfriend's bike. The SPCycle had the better geometry of the two out before this