I understand why one would want to pack light especially if there is a lot of connections but I much prefer to pack light and throw it into a hardshell bag and not have to worry about it until i get to my final destination. Having to fight over overhead space or keep a bag next to you on all your connections is just cumbersome. I keep my electronics in a small backpack and then meet my luggage when im finally where i need to be.
I do think that the onebag crew has some useful advice like packing cubes and tips and tricks but I agree they take it to the extreme where I do not see how travel can be enjoyable for them.
I do live by one rule though, if you cant carry it dont bring it, even though i end up carrying my girlfriends stuff anyways so clearly doesnt work out too well for me haha