All I know is that on the TTT server that's up a lot nowadays, the FOV is always still slightly wrong even after I do the /setdeafualtfov command. Maybe I'm an idiot as I haven't been keeping up with the game or addon development much over the last couple years, but as an average user who doesn't know wtf is going on, I can vouch for the idea that I would much rather just loving press the zoom key than have an addon try to zoom for me or whatever then have to do a command to fix it, only to have it not quite fix it correctly.