Getting a real fear of death or lasting injury for the PCs would be an even bigger step...
Yeah. To the point where doing so puts you into "Why are you trying to use a screwdriver as a hammer?" territory, and will have consequences on the rest of the mechanics.
We should note that in SCRPG, scenes aren't tests of tactical wargame acumen. They are scenes in which the villains are trying to accomplish something, and if the PCs don't stop them in time, the villains get what they want out of the scene. The scene track is a countdown clock to failure, even if the PCs are at full health when they get to the end of it.
Being alive will be small comfort when Baron Blade pulls the Moon down to collide with the Earth, or Grand Warlord Voss overruns the planet.
Death isn't off the table in SCRPG because players are weak, or something. It is to enable them to take some pretty outlandish comic book style risks without worrying about ruining their future play experience.