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If you are shredding single track and hucking- It is not needed.
If you are doing long rides and long climbs "training style" like you do on a road or gravel bike, a powermeter can be helpful.
There are a few MTB climbs around here where pacing is relevant...
and if you're doing an all day enduro then having a PM can give you some guide as to how your overall pacing and nutrition are going to work out.
Less is more.
I have one on my XC bike. I don't look at it while i'm riding--I ride based on feel--but it's useful for tracking load and keeping the power duration curve built out, although of course sometimes power will understate the demands of an MTB ride. Even though i pace basd on feel, every ride has a purpose and power is a good objective measure to tell you how well you hit it.
even if you like to shred or do enduro or downhill or something like that, if you race, you're probably also training, and probably therefor doing intervals (on your shred bike), although they'd have a very different focus than the type of intervals triathletes do. In my view, it'd still be useful.
I race a lot MTB. From 2h to 12h in duration. I find the powermeter highly valuable. For just the same reasons as on the road.
Over the years it has helped tremendously in understanding race demands. 2h hour races are almost exclusively Zone 1/2 and Zone 6, for example. You have to train accordingly. My longer races have often long, steady climbs on dirt roads. Training and pacing, just as on the road. Especially in those very long races pacing these long climbs is vital. Sure, could be done w/o a pm but the same would be true for the road.
It also helps to sync efforts when training on the road and on a MTB. However, I don't use nonsense like TSS & Co.
Furthermore, I use the reported work in my daily energy balance to get the food intake right. Especially in high training load periods.
Of course, if I was into downhill MTB I would probably not see that much value in a pm.