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Just had a quick google myself. There are issues with the m8000. Here is a review but keep googling and you’ll find more. Saying this, there must be tens of thousands of content users out there. It did put me off when I was building up a recumbent though.
https://www.singletracks.com/mtb-gear/shimanos-2016-deore-xt-m8000-brakes-lack-the-reliability-the-brand-is-known-for-a-long-term-review/
I’m not a MTBer but aren’t the XT model the only with issues or was that the previous generation?