I’m never going back to wearing a bag. Bottle cage, SWAT downtube and a small handlebar bag and I can carry enough tools/gear/snacks/water filter to ride 8 hour epics in Colorado. I’ve got waterproof matches, a small fixed blade and an emergency blanket in the downtube so an unplanned overnight would be uncomfortable, but survivable. Food and sealant are dense and heavy, but carrying them at the bottom bracket is way better.
Really stoked to see that Trek was able translate the “hole” to aluminum. I think that it’s a feature that will be as necessary as a dropper post. Personally, I won’t buy a bike without it going forward.