In the first place, you are recycling pieces of conventional wisdom. We’re talking about vocal harmonies. Not only did the EB influence the Beatles, but the Hollies as well (who even played on the EB albums recorded in the UK.) Both groups admitted it, and probably in order to avoid comparisons, refrained from recording Everly Brothers songs, which were more country oriented than either of these groups. There is nothing ‘debatable’ in this.
I responded to this statement in 27 which is the statement in full:
“Probably the biggest influence on the early Beatles.”
Nothing qualifying it as influence limited only to vocal harmonies.
Of course the Everys were the biggest influence on their vocal harmonies.
Biggest influence on just about any group that came after them in terms of vocal harmonies. Unless the Louvin Brothers who influenced the Everlys were in the mix.
The EB were pioneers in R&R from the era of the late 50’s, early 60’s when I was growing up. Sorry that I never got to experience them in person. At every sock hop they always played several of their 45’s. Later, as a musician, their songs were always on my playlist and those of many other 60’s garage bands. I can’t imagine Phil is really gone and the EB are no more. Long live their memories. RIP Phil.