I would only do an integrated rack and a dynamo on a dedicated touring bike. Not for a bike I want to use as an all rounder then do the occasional loaded tour, I mean a bike that exclusively gets used on long / loaded tours.

I currently use my Soma DC disc for commuting and light/weekend touring. It works great for that, but if I was riding thousands of miles I would want more relaxed geometry.

I have ridden mechanical discs for a few years now and I really like them. When I have my custom built, It will probably be set up to use mechanical with the option for wet discs in the future (when they inevitably become more affordable and reliable).