The French solved this decades ago, many are rediscovering their design.
Don't load the back of the bike and you can design a bike that rides well with or without a load. If you rear-end load a frame, you really need to stiffen it up in the back. Doing so has the downside of making the bike feel sluggish when there's no load. The Surly LHT is the modern epitome of this design.
How do you carry everything you need for touring in the front?
Large handlebar bag and lowriders. Low trail so the extra weight in front doesn't negatively afffect handling. If need be, a saddlebag for bulky, light items can be added.
8 out 10 of the bikes in the following picture were kitted up as described, above, and travelled from Portland, Oregon to Carson, Washington to camp out for the 2016 un-meeting (BQ's Jan Heine annual get together).
After camping overnight, the next day was 90 miles of fast paved/gravel riding. Gear and bags were removed.