Entwistle was in a unique band situation. A band that had a drummer, guitar player and singer that were all quite terrible at their roles musically but all good at putting on a show. That's why there is excessive volume, laser shows, smashing instruments etc.
Someone had to hold that together musically, he had training so it fell to him really. That why he played so many damn notes, he was covering for the rest of the band.
He needed volume, so more powerful amps. He needed clarity, so sought a way to make that happen, he was all about more treble. He was instrumental in the development of the round wound string.
Am I a fan, no I am not, I hate his twangy sound, it was his bass version of Duan Eddy. But I do appreciate the difficult nature of being in a band of average musicians when you are trying to make a living out of it. I think he overcame his challenges in that band, cemented his place in rock history and have people idolize him.
And to those that think I haven't listened enough.
I heard The Who my whole life. My dad is an extreme fan of late 60's and early 70's music so plays it a lot, always Beatles, the Who, Hendrix, Dylan, Zappa, Led Zeppelin etc. The difference is I don't have nostalgia attached to it, I listen to it all, if it's good it's good, if it's bad it's bad, if it's overrated it's overrated.