Compatibility ought not to be a problem - I don't see why if Posette can be mapped to take V2 textures, any new figure can't be mapped similarly. Personally I don't think a new figure is really needed, but if it were, it would only be on the basis that (a) it could behave more realistically than V3 in a wider range of poses (e.g. hands above head) and (b) be more realistically shaped. Ease of use is certainly important. It's why I don't use EJ more. Morph injection - ugh. Done by Daz for Daz's benefit alone.