Agree. Tho that would be more about Rally2 imo, where i domt think theres a necessity of big car developments, it should be more about drivers and costs.
however, if FIA and Promoter manage to lure ralliart (team) with mitsubishi body panels, x-raid with mini body panels, prodrive with renault body pannels, vermont or petter solberg team(?) with subaru body pannels, msport with puma, gazoo with yaris, etc.. then i would not care about a 'spec' rally1 structure, as long as they can bring their own engines or something like that
(haha not plausible, I KNOW. just wishing out loud)