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a loose ball BB isn't likely to be worth more than about 50mW to a racer
This does not matter to me. I have 36 spokes front and back, not even double-butted spokes, just regular DT Champion, weight and micro-gains doesn't mean anything to me. Simplicity matters, and what's simpler than loose ball and two cups?
I've opened the BB a week ago, just for the piece of mind, and it's like brand new. While riding it daily for the past 8-9 months. But I'll repeat it this winter to be on the safe side.
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.