To me it comes down to being able to cover the brake while shifting. Now that I'm used to brifters on the road bike and grip shifters on the hybrid - both of which let me do that - I'm reluctant to part with that extra reaction time on the brakes.
As far as field repairability ... in my mind, shifters are in the same category as spare spokes and bottom bracket tools. Way more hard core touring than your average bear. There's a whole universe of mechanical problems that MIGHT happen, and a spectrum of preparedness vs likelihood vs everyday hassle that you have to make your own judgment about. I carry spare cables, both brake and derailleur; a chain tool and a couple of spare links; patch kit and mini-pump to back up my spare tube and CO2. Beyond that, in a worst case where I couldn't limp it home before dark, I'm never more than a mile or two out of cell phone range. Shifters just aren't something I even worry about. (And I *did* have a brifter get gummed up on a ride once, not knowing what it was, and not really having a place to get solvent any closer than home anyway. But it's still not something I worry about.)
If you're doing randonneuring or unsupported back country touring, then yeah, you're going to want straight levers not detents, i.e. downtube or bar end shifters not brifters. But for any kind of commuting, day riding, or not strictly time limited touring east of the Mississippi in the US or comparable densities elsewhere, I just don't think it's necessary.



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