would you like to see them return?
or
do you think they will not be as useful because of the changes to the energy system?

if one or both do not return what would you like to see instead?

Energy transfer won't be as useful since you can sprint for eternity anyway. Something like energy transfer could potentially be an upgrade for an armour module though, ie. making a kill restores your armour (OP??).

Nanorecharge level 1 should return, but the level ups would need changed.