Precisely. Any attempt to "optimise" the specific energy of a storage approach will inevitably bring it closer to closer to the point where it explosively disintegrates.

This is why it's a bit hilarious to see how upset people are about lithium batteries occasionally exploding. That's... sort of the point! They've been optimised until the safety margin (=weight) is a low as possible. You want safe batteries? Carry around something the size and weight of a brick!

Ditto with all possible kinetic energy recovery system (KERS) designs. You can have weight-efficient or safe, but not both.