Messi has three problems atm
1 declining powers, Shot power, stamina, pace have all noticeably declined.
2 weak mentality for a GOAT, doesn't motivate his team to keep pushing for wins, tends to sook, and become lazy.
3 his influence makes the board and managers terrified to do anything, he has been so pampered and spoiled by the club that they'll bend over backwards for him and his friends to the detriment of the club.
He is still the overall GOAT but no one is perfect and I doubt many disagree with these flaws.