Werner, if I understand your metaphor correctly, Jetstream is the default strength push, and Force Push is a half strength push. You don't need to spend extra mana on a push through a damage barrier unless the card says so, like on Force Push.
not exactly.
Arena Wall:
3-cost Force Push [3-Die bashes] the target against the arena wall.
4-cost Jet Stream may [3-Die bash] the target against the arena wall.
So there are the exact same strength of "push."
Thorn Wall:
3-cost Force Push does zero damage; as Errata released states that P.A. walls do not bash.
6-cost Force Push does (2;2;2;2;2)-die damage from Thorns.
4-cost Jet Stream does (2)~(2;2;2;2;2)-die damage from Thorns and ~daze.
(~ = @chance)
So you're wrong about half-str. Jetstream may do a double strength push at a premium. And it's actually broken compared to Mage War's own pricing schema.
And if I were to get metaphorical (I was speaking about math), I would remind you all that a wall of thorns would actually help protect you from strong winds.