They were a mixed bag, varying from dwarf to dwarf. Dopey and Doc were noticeably well done. Grumpy…it depended on the shot, IMO. But I’m no fan of cgi.
Would humans have been better? As far as acting and connecting, of course. But when you see them in action, I think certain scenes would have been harder to shoot - unless they reversed it and used people, but made the background cgi.
I think a Mary Poppins effect may have worked - but I think their choice was consistent with the other remakes (that I’ve seen.)