When you hear the vocal stems from SOAPF you really do realise how intelligent the production choices on that album are. Anders' harsh vocals are just as shot on SOAPF as they were on ASOP. Possibly more so. Still, because the production is so wide and chunky it basically absorbs those vocals into the mix and injects them with the power that the instruments are providing. It creates an impressive synergy between the two, which is completely lost on future albums.
Frankly whoever produced/mixed the vocals for SOAPF is a magician. You have two songs in Ropes and Liberation which are almost all cleans, yet, in my opinion at least, Anders actually sounds good on both. I enjoy each song, inclusive of vocals. Compare to Come Clarity or TCP, where Anders' cleans are just terrible. No matter what anyone thinks in regards to the merits of either song, his cleans are objectively horrible on both. We know he still couldn't sing by the time SOAPF was recorded, but man, whoever produced those vocals did a tremendous job hiding the weaknesses and letting everything blend together in a way that actually sounds pleasant to listen to.
What I can't understand is why they decided to go a completely different route afterwards. Anders should have heard how his vocals sound on this album and said 'we're sticking with this production crew until the bitter end'. Instead you get the mess that was SC, and then teaming up with Benson and his autotune machine, which to my ears sounds far worse than the vocals from SOAPF. Dem LA connections, though.