IsanRido said:
And again, just because they were slightly important in the first film, there’s no reason to feature them again other than “Hey cool! It’s CP30 and R2D2!”.

R2 fixes the hyperdrive in ESB and C3P0 kind of helps the crew from being eaten by Ewoks in ROTJ. So they serves some kind of role after STAR WARS.

EDIT:

mfastx said:
The only thing that doesn’t happen is the destruction of the utterly pointless Hosnian system.

And the destruction of the Republic Fleet. That’s going to play a big role in the rest of the ST. I’m glad that it’s gone but at the very least it’s going to impact things in the future.