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You and I can strip and rebuild a conventional BB (although I personally CBA), but we're a long way from typical, even among 'proper' cyclists.
Well, I've never done it, and I'm far too off to fit in your comment. I'll clean and re-grease the S75 this winter for the first time (technically second, see the next reply), by myself.
But I think it's an over-exaggerated issue. The simpler the better, less moving parts, better it is. And I convinced myself numerous times. Always doubted myself, but realized I always do a better job myself than the 'situated' mechanics. Two years ago I was completely clueless, now I acquired all the tools and doing everything myself. Was burned too many a times already.
Which crowd? :-)
You and I can strip and rebuild a conventional BB (although I personally CBA), but we're a long way from typical, even among 'proper' cyclists. As I pointed out in an earlier comment to @umop3pisdn , a loose ball BB isn't likely to be worth more than about 50mW to a racer, so having something which requires skilful and frequent maintenance seems a bit pointless.