Soldier takes no skill.
Demo man takes aiming, timing, precision, awareness.
Soldier takes spamming the rocket launcher while standing next to a dispenser.
Lemme guess, you're on Team Demo?
But yeah, neither of them take skill.
Demo = Lodge grenades into doors/walls to bounce off of/corners and stickies set up on an important doorway/spot and the demo camping to repeat
Soldier = Rocket spam snipers, sentries, heavies, anything that moves slowly or doesn't move but is important to get rid of.