Dude you are embarrassing yourself. Leo left Barca in very strange circumstances, aged 34. Realistically he could only go at one club that could cover his wages and tolerate his playing style (I mean no defense, which is a must in CL). First season was bad, second one was ok. If you want to go to stats and titles, he did win the league in both seasons, scoring some crucial goals. Yeah PSG were overwhelming favorites to do so even without him, but had lost the league in 2020/21, when they were supposedly at their best form reaching the CL semis and competing against City.
In any case, even if we admit that Leo failed miserably, this has little to no impact to his legacy, BECAUSE HE WAS 34. You people are acting like the dude went in PSG at his prime and failed. The man had won everything that could be won at this stage, was forced to leave Barca (or at the very least had to leave very abruptly) and obviously wanted to focus on Argentina at this stage of his career.
If you want to count these two seasons as complete failure, go ahead. But if you wanna go there, let's examine the club career of the supposed #1:
-Went to Juve aged 33, which means that he was at a similar stage like Messi in 2021. He openly admitted that he went there to win the CL. The best they managed was getting KO'd in the quarters. He put some good stats in his second and third seasons, while obviously experiencing a steep decline on his overall game. His stats in the end meant nothing, as his last season in Italy was the first season that Juve failed to win the Seria A since 2010/11. One could say that building a team around an aging narcissist could not lead to another outcome
-Then he famously hyped his return in Manchester aged 36. He had some good moments in the first season, but we all know how things turned out. I am not going to go there and slander him though, as ManU is a known dumpster and the man was well beyond his prime.
-Finally, let's talk about his prime, his time in Spain. I have already analysed how, while being overall good to fantastic in all 4 CL wins, he was lucky to be supported by his teammates in some of the wins (mainly 2016+2018), in ways Messi could never dream of. But ok, let's keep it classy and admit that CR is probably the CL GOAT, just based of accomplishments and iconic moments (though Messi at his very best was better IMO). But how about La Liga?
CR fanboys famously forget that CR played in La Liga for 9 years. It is as if he was on vacation for 9 years. In those 9 seasons, the final count was: Barcelona 6, Real 2, Atletico 1. Not really flattering. Both Leo and CR played with fantastic teammates and were coached by great managers, so there's that. The thing is, that in those 9 seasons, the La Liga title was decided in the final 2-3 fixtures a total of 7 times (4 for Barca, 2 for Real, 1 for Atleti). The other two times Barca won comfortably (2013 and 2018). It can't be a coincidence that Leo and Barca almost always came on top. Maybe it has to do with the fact that Leo almost exclusively was crucial in all big moments, including the Classicos (in which Barca had a record of 10-4-4 against Real from 2009/10 until 2017/18 iirc).
So yeah, go ahead and count the 2 years at PSG as the crucial moment in Leo's legacy