This is an extremely important and necessary thing that is worth it. Now why we need mod support??? Just because if fh6 is the last game that will end one day and from that moment on they will never fix any features, fix bugs and add cars and never make a new game.
So mod support is really needed only for the last game in the franchise
Especially for those who expect forza devs to make more updates, they can use the mod.
Mod support, for example, to improve graphics, adding features and cars, improve the gameplay such as sense of speed, fix the sound of cars, fixing bugs in game, redesign ui and hud and so many other things that can be imagined! Long story short just like assetto corsa, need for speed, beam NG drive
So please add mod support with every new details for fh6 in core game or before last upcoming updates
Note: The mod support is only for the making last forza horizon game (probably forza horizon 6) in the franchise. It should only works on PC, but I doubt it on xbox.