Campy Ergo brifters address and/or eliminate most of your comments on the disadvantages of brifters.
-They have a "micro-shift" ratchet for the front shifting so you can trim any deraileur to center it over any chainring, including triples.
-The upper lines (Record and Chorus) allow a full sweep of both the cassette and chainrings in both directions, upshifting and downshifting.
-Ergos have had the shift cables under the bar tape since the 8-speed days so they don't interfer with any handlebar bag.
-Ergo brifters can be rebuilt so the durability issue is lessened
I ride the drops a fair bit but I don't, and most other riders don't, climb with my hand in the drops and that's where the ability to shift from the hoods or tops is so very welcome. For the record, both Ergo and STI brifters can be shifted from the drops if you wish. Bar ends can only be shifted from the drops. I'm not frightened of them, I've used them more than enough to give them a good evaluation and found brifters better in almost all conditions.
Finally, I assume everyone is going to say, true but they can only be used with Campy (read expensive) components and their gearing range is limited. Well, Jtek's Shiftmate will make Ergos compatible with otherwise all Shimano components and they shift like a dream.
I suspect I have many many more tens of thousands of miles riding Campagnolo Ergo than you do. But I have never bought into this adaptor thing. If you want to use Campagnolo, then use Campagnolo shifters, hub, cassette, rear derailleur. Don't add adaptors that may or may not work into the mix. Especially not on a touring bike. Reliability is something most people want on a touring bike. Shimano is the only touring component maker. SRAM does not make a triple shifter. Campagnolo does not make cassettes bigger than 28 or 29. And is impossible to find in the US market. Easy to find and replace parts is crucial for a touring bike. I'm aware IRD makes some kind of adaptor cassette that fits on the other hubs or has spacing like the other company. But again its a specialty adaptor part, not commonly available.
As for Campagnolo being expensive, this is a myth unknowledgable Americans perpetuate. European bike shops, mail order places sell Campagnolo for less than the cost of Shimano. Anyone who buys Campagnolo from the US is just wasting money.