I've never bought a loot box and doubt I'll start now.
Will be interesting to see how this affects up the game economy. Money has never been an issue with forza. I've got like 400 million in Forza 6 with nothing to use it on, and probably gave away a few hundred million in horizon 3 for the same reason.
This is what I meant with my earlier post.
Yes you get a much bigger bonus for playing without assists but I don't think it makes a huge difference by the time you are atleast halfway through the game.
If you are finishing top 3 in every race, with or without assists you should be loaded with credits by the time you are atleast halfway through.
I'm not in favor of the whole "pay to win" but I think forza is nowhere close to other games in this regard.