I thought this issue was limited to TTL functionality. I assume those producing great flash images at wide apertures where the issue arises are shooting manual, which should be an option for many. It doesn't mean I'm not irritated at Godox for not fixing the issue though.
I admit, I've held off buying the AD600 because of the bug (I shoot the A7RII), but may end up picking it up in the next few months with the intent of using it in manual mode when shooting wider than f/4. I'm fortunate that my work (portrait/glamour) affords the ability to shoot in manual if necessary. Some may really need the TTL functionality, and as you suggest, might be better off picking up a ProFoto kit for example.