Rob
Ansys Employee

I don't remember that ever being a limitation, https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v222/en/flu_ug/flu_ug_chp_adapt.html   The only issue I remember was trying anisotropic adaption on anything that wasn't a hex or prism cell. 

You can still create registers on y+, whether there is a better option will depend on why you think you shouldn't be looking solely at y+