Barely lukewarm take:

SE have tried repeatedly to remove Energy Drain and have always ended up adding it back in because of design/validation errors and community pushback.

Its current implementation is deliberately sterile and on the verge of being a pointless button specifically so that when they do inevitably remove it yet again with Dawntrail, few will mourn it's current incarnation's passing.

At best it stays as is through sheer disinterest on SE's part, at worst it disappears with no spender or alternative added to take it's place. Fingers crossed Yoshida proves me wrong on this one, but I'm not hopeful.