They did wonders with some of those numbers.
Delta Blues, Gospel, Country and Appalachian folk are all the groundworks of rock and roll and later rock which Led Zepplin epitomizes
what you don't understand was that no one had done this before...Yardbirds and Cream touched on it but Zepplin really mastered the genre of medieval sounding trippy blues rock..like no one else
are they overplayed...hell yes
were they good live>...no...not to me..poor actually
Pink Floyd...a band one would think would have issues replicating their studio sounds actually recreated it live better than LZ
Best recreation I ever saw...was Jethro Tull's Aqualung tour in 1972 as well
and btw...I am hardly cool..I'm old...you can't be old and cool