I check out OneBag stuff on the internet every so often. Sometimes I'll find good travelling tips or secondary uses for items. But so much of it is so wrapped in brands and buzzwords and precision it makes me laugh. It reminds me that even if I share some of the ideals with this community, I probably wouldn't travel well with a lot of them haha.
I'm with you: the more replaceable and maneuverable the better. My focus is on freeing myself from as many logistic problems as possible while remaining tolerably comfortable. I've travelled with one bag in a few different countries, doing a few different kinds of things. Every trip I get a little better and carry a little less.