Arcane Missiles vs Rapid Fire

Why does arcane missiles hit like a wet noodle compared to rapid fire?

Because some dev doing work for BFA decided to re-do the spec and make missiles a joke.

They’re back but no where near as impacting as they used to be but at least they’re more than the mana-saver they became in BfA.

I don’t pve really any more, and I find that essentially 99% of class forum posts are about pve, but I would assume that since Arcane missiles is up constantly with the clearcasting proc plus the 20% bonus to arcane blast for 2 casts, that it’s up more often than rapid shot, no?

Sure, they’re both channeled abilities, but I don’t think the similarities go much further than that.