OTG assists aren't that valuable in Ultimate.
For a lot of characters, it's best to combine an OTG move from the point character with a projectile assist. That allows for OTG combos plus an assist that can actually help you in the neutral game.
Wesker's shot was considerably more valuable in vanilla when OTG moves weren't as widespread. Morrigan and Magneto are the only two relevant point characters I can think of who can't self-OTG for a combo, and in Magneto's case it usually isn't relevant because he doesn't need to OTG to convert off of throws in the first place.