This conversation is too Daystrom for Risa. I'll agree to disagree :old man shakes fist at clouds:

because I can't stop me:

Mushroom warp was "bat shit crazy" to pretty much everyone.

the last ship that tried it disappeared, presumed lost with all hands.

Section 31 probably has the whole story locked in a cabinet next to Mirror Universe Spock's Goatee.

I think there was a whole plot about how using it hurts the thing that is the mushrooms? So like, ethically, that's a no go.

By the end of Voyager, the Federation is beginning to understand how to build trans warp gateways (Borg tech) which is, at least practically, close enough to mushroom warp that it's good enough.