Keep in mind that:
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Only a fraction of people on mountainbikes care about XC racing, or have any intention on participating in a race. It’s recreational riding, for fun.
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Most people cannot afford a quiver of bikes. If you’re not racing XCO, it’s better to be a bit over biked than limit yourself to an XC type bike. Your one bike may serve you on the flow trails, as well as for the trip o the bike park.
Also I think a lot of people would answered aren’t riding/talking about what the modern “Enduro Race bike” is, but rather 130+ travel trail bikes/all mountain bikes. I almost never see anyone out on a full on 170mm enduro bike, and I live near trails where you could use on.