No it is just a stylistic choice mostly used by Metallica, so it was for example.
No it has not much to do with the quality of what Clive
does, it could have something to do with Harris wanting something other and Clive not going by it. From this perspective McBrain is far more professional and used to keeping on with the demands of the bassist because he was a session drummer. A session drummer does not have choice in what he plays, bottom line.
Of course not
But you also know that I know 99% of Maiden's material ever recorded in any way, by heart. So I strongly presume my statement is correct. Also, I have never seen anyone back up the claim that Burr was technically on McBrain level either. I mean if someone here says Smith is technically on Malmsteen level I'd expect to see some continuous fast sweep arpeggios, not the talk how his music fits the genre better.
Bruce is an Ian Paice kind of a guy. Clive is an Ian Paice kind of a guy