Coming to the end of my third year on my Zerode Katipo with Pinion C12 and carbon belt drive. Have done 3 oil changes and no other drivetrain maintenance on a bike that is ridden 4-5X per week in pretty filthy wet conditions. Whereas my Stumpjumper with AXS requires regular cleaning/oiling/ new chains etc. The whole issue of shifting under load just disappears with experience, and the benefits of swapping any number of gears in one quick twist is far more relevant. I would never swap to a trigger shifter for this reason.
It is great to see more genuine trail/enduro bikes like the Machina with a gearbox. All of these longer travel bikes are getting heavy now, so the gearbox bulk is much less of an issue than on a 10kg/22lb XC bike. I cannot imagine NOT having a gearbox bike in the garage at any point in my future. And if I ever succumb to an e-bike, it will have to have a Pinion linked to the motor to avoid the drivetrain wear and tear that electric motors subject a normal derailleur system to.