Uematsu I like to think is 50% responsible for how special FF used to be. I don't think he can make a bad score. The Last Story is his weakest I know of and even it's still great. The music was the only good part of X. After he left no FF soundtrack has been worth listening to.
I agree with the part where you mention that Uematsu is responsible for 50% of what made the series special.
But to say that no FF soundtrack has been worth listening to since he left? I can’t get behind that. Because while no soundtrack in the series reached the peak of Uematsu’s virtuosity, Hitoshi Sakimoto did an excellent job on FF XII, and there are plenty of really good tracks in both XIII and XV.
That being said, the soundtrack in FFVII Remake really gives a second life to the music Uematsu composed for the original, and the improvements made to the sounds, either via real instruments or much better sound samples, makes the music one of the strongest highlights of the game. A testament to how outstanding and timeless Uematsu’s compositions are.