No doubt, George's slide guitar would fit into the Beatles sound, AS IT DID on "Something" and "For You Blue."
I also heard a lot of quasi-slide over the earlier years, there was often a brief hold-slide move on the 12-string which enhanced the bell ringing sound on some songs, to my ears.
oh totally, i agree. georges slide work was definitely an extension of the beatles sound, a perfect fit for many songs. the beatles were very careful not to overdo some things and some songe genres. however, i was under the impression that it was john playing guitar on For You Blue, but i also think of george when i hear that song.