Maybe so, but I always find that this is grossly overstated on TTW. Everybody that rates Safin (usually to a ridiculous degree) uses AO 2005 as some kind of barometer for the challenge that Safin could've would've should've presented to Federer, but Federer really should've won that match if you look back on a few crucial points that on most days Federer would win. Not only that, he was better on clay, so much better on grass, and in all likelihood would've been better at the USO even against this mythical motivated Safin. To be clear, this isn't an attack on you.
I'm not denying that Safin wasted most of his talent, but outrageous speculations that he would've been a double digit slam winner (sometimes seen around here) or taken a bunch away from Federer are just crazy speculations that nostalgic people use to overrate him in the first place. Guys like Nadal and Djokovic are more talented (especially in the all around sense) than Safin IMO. For example, both of them are faster, both are mentally tougher, and both have more stamina than Safin for starters. Two of them have a better FH (yes two of them) and Djokovic's BH is certainly in the same ballpark (with Nadal's usually being underrated) Djokovic might also have a better serve, and Nadal's serving is pretty good when he locks it in.
The reason I'm comparing the 3 being that the people that talk up Safin here will often say he's more "naturally talented" than both, which obviously I'm taking issue with. Again, I don't deny that Safin wasted a fair amount of talent by not working hard, but the extent that some on this site go with their predictions are far fetched to say the least.