So adding the experimentals to the 5A was a bug not a feature, and hence not rolling it out to the other drives.
But does it do any real harm, That extra couple of LY will make gameplay better and a quality of life improvement. Or the slighly less heat/more integrity whatever.
Its even with a neutron boost, a carrier can still jump further, so its not unlocking any more inaccessible places in the galaxy.
Bit like the neutron boost bug/typo whatever that was when that was first introduced to the beta, as the 300% boost was originally not intended, and was changed in the second beta. But rolled back for the live game. It has revolutionised faster travel about the galaxy.. Although them white dwarfs are not worth the hassle of scooping!
A CG for more drives and to unlock the engineers ability to tweak the experimentals?
TLDR: Let us put experimentals on the FSD, It would improve QOL for little effort/side effects.