While I agree a 4 port 100 PD is future proof, I am pretty confident it can be shrunk to make a smaller travel charger. If I had a Atom 4, I'd use it a lot at home, but it would not leave home. Same way my 26800 doesn't leave home but my 10000 leaves often and travels round the world.
The main reason say a Powerport 4 is smaller than the Atom 4 is electronics efficiency. That will improve over time. It doesn't matter a dot at home, does when cramped in an aircraft's seat, seat power and under/over luggage.