Most of my friends and I have ditched the ‘stable’ in favour of a single bike.
I’ve got a Cove G-Spot, no it doesn’t climb like some carbon HT 29er wonder bike, and yes I got passed a few times by lads on V10’s and whatnot in the Alps, but the margins aren’t nearly as big as you might think and I don’t ride competitively anymore so I don’t really care if I’m a few seconds faster or slower up or down something.
In it’s element, which frankly covers 90% off all riding it’s seriously effective, but more importantly fun and personally I gain more performance from increased familiarity than I would with a couple of extra inches of travel or a couple of Kgs less weight.