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T47 is growing, and that allows for both for good bearings on big spindles **and** wide bearing spacing for actual stiffness*. Trek is using it on a ton of things, although they're also pretty much all DUB cranks.
I think 30mm crank spindles are like 35mm bars: provides nothing more than a chunky look and maybe a tiny weight savings, and a bigger number for marketing to splash around, while actively making things worse for many riders, _but_ they're not going away anytime soon, probably not ever.
*(I never understood the argument that BB30 added significant overall stiffness just by increasing the frame stiffness with the larger diameter BB shell, while leaving the width at a tiny 68mm. Widening the bearing stance ala external BSA, BB92, or T47, is going to do so much more for effective BB & crank combined stiffness)
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