I'm probably in the minority, but I agree that Weekly Challenges have made me want to engage with the game less.
Every time I see a track I enjoy, with some of my favourite cars eligible, I think to myself, "oh what the heck, it's good money even for completing 1/5 events." I proceed to do that event, only to be reminded of how much I LOATHE the AI in this game. By lap 2, I'd already have big damage on my car from someone brake checking me at the apex of a flat out corner, and I'd hate myself for having even tried to enjoy the single player side of Gran Turismo 7.
The first credit prize tends to be good money for time invested, but the prizes as a whole are utterly underwhelming. The garbage Roulette Tickets feel less like prizes and more of an insult, and offering more of them as prizes simply doesn't motivate me. There is no way to convince me that I ought to spend maybe 90 mins of my time to earn a top tier 5 star ticket to have a microscopic chance to win an invite or an invite car, which in my view are the only prizes of value left in these tickets, as S parts and engine swaps can now be bought with credits.
To me, the Weekly Challenges utilise and highlight some of the worst aspects of this game, and trying them even occasionally makes me go "NOPE!" without fail. I'd much rather spend my time elsewhere, be it liveries, photos, writing, or just other things in life besides GT7.