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Fucking SRAM
Shimano can already do mullet drivetrains. Their main limiter is the lack of support for FD when using XTR RD. My MTB is cable with 30x51. I could probably get that working on the gravel bike with the mod I posted earlier in the thread. But I'm going the other way now - using my MTB more and then having a road/gravel bike which I'll probs keep around the 30x42 or 30x36 range.
Wait until shimano catch up with SRAM like mullet drivetrains, or get SRAM and slap a massive 52t