An observation taking bits from the first and last sentences of the above post:

Not folk but ... then Not sure if any of them will be played at folk clubs

If its not folk why on earth would anyone expect these songs to be played in a folk club? @Blackbird' and 'Norwegian Wood' aren't folk songs either.

McCartney was tremendously successful "pop" artist in that he made money. As to him being "musically important" that is entirely a matter of opinion.