If we go way back in the history of rallying, lets say 60's or 70's, they rallied cars that you could by, modified versions ofc, but close to the model in the shop.
That time is defintly passed, the closest we get today is Rally4 and Rally5's.
The main point for the teams involved was to sell cars to the people watching it in the forrest. And use it in advertising, or pictures and results in the newspapers.
"Win on sunday, sell on monday" was Fords slogan.
I don't see any manu's advertising or use any ralling in commercials.

Is it any point to have this manu-involvment any more? Whats the point?

If a manu like Škoda or Hyundai make a "Rally2" streetversion with AWD it would make some sense, but you can't even by something close to a rallycar (exept of Toyota yaris GR ofc) in the shops, maybe it has to go back to a semi-profesional reality, times is over for the dream of F1 and the politics of the FIA and the manu's, rally as a sport has to go back to its roots and soul to survive i'm afraid.

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