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BareNecessities
@giofox
My contribution to this (much awaited point in time):
Shimano GRX 600 / 400 / 800 - Agreed on the 2x giving you better versatility for road/offroad use, 30-46 with a 11-32 cassette would require no fettling for the riding you are describing, including, small cassette, no large jumps, shorter chain (and less slap). You can mix/match components to save money on the groupset, the only thing that makes a difference is the clutched RD and the '800 shifters are nice, everything else can be GRX600 or 105 (not the sub-compact crank).
VEL 28mm Alloy Disc Wheelset - Assuming you will have one wheelset but wanting to ride multiple surfaces, in winter, will mean swapping tyres, which is why you should start with tubed setup (latex tubes allow lower pressures anyway). You can always move to tubeless after you confirm how much offroad you want to do. That said, being running tubeless on the commuter for months now and I am sold on it.
Pro PLT Ergo flat top bars - No need for flared bars imho, unless you plan on some gnarly bikepacking or mountains expeditions. Just go 2cm wider than your normal road bars and you'll be good. I like Zipp SL 70 Ergo, not much flat top, but enough.
Gravel King Slick or similar - If you are dead set on using a single tyre for all of the described riding, Vittoria Terreno dry or zero roll nicely and have some shoulder bite.
Mudguards - just fitted Kinesis Fend Off Wide, which are nice and cost less than half of PDW, and would be on brand with the bike.
Let me know when we're riding!