Adam Clayton is a big influence on my bass playing. Especially from The Joshua Tree and Rattle And Hum era. He does what a bassist should do and supports the song and the band and acts as an anchor for The Edge and Bono. Nothing wrong with that at all. For me, that's the job of a bassist. And for U2, it's perfect!
Interesting quote about not being a virtuoso. I think many of us feel that way, and simply underestimate our abilities. I've always considered myself average at best, but when I listen back to my band's old recordings from the 90s, I did some creative stuff. Coming from the same punk/self taught background, I think that frees you up to be more creative since you don't know the "rules". Later on when I learned scales and some theory, I became more self conscious of my bass lines and playing "proper notes". And I found it more restricting. Just my thoughts.
PS. Me and my friend Niall have a Podcast dedicated to Adam Clayton, his bass lines and bass gear. It's called Clayton Rocks and can be found anywhere you find podcasts.