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but do those MTBs pivot at the BB, and hence maintain continuous distance from BB to rear hub
No - for the simple reason that there's a thumping great gearbox in the way.
And probably for the slightly more complex reason in that it's hard to build a good suspension platform that keeps chain length constant through the travel.
Howard
Baerli_Baer
A little lazy to google the details, but do those MTBs pivot at the BB, and hence maintain continuous distance from BB to rear hub, which is why they work there and not say not on a Brommie, as it pivots behind the BB, so distance between rear hub and BB changes throughout suspension travel.
My understanding (which is often wrong) is that belt drives often still have/use a tensioner/snubber so as to maintain strong tension on the belt to avoid belt slippage, as opposed to taking up slack created by moving rear wheel (not pivoted at BB).
TBH, it's been a good while since I looked into this. Tech/materials/techniques may have moved on this then!