Yay. I like the OLD way of how it works. I think that running out of time would be useful if Jetpack could be used to get to some secret place to get more good stuff, which can't be taken without using Jetpack. But right now you can get almost everywhere by using Laser, Mortar, RL, HLAC or Hook. So I think it would be useless if Jetpack would last only 30 seconds. One of the most cool is the ability to use it while the enemy doesn't know you have it.
Just my view on this matter.
I'm making
Liblast - a FOSS online FPS game made with Godot 4 and a 100% open-source toolchain