This is likely to fall into the depths of the forums, but I can always hold out hope that someone from DE might pick up on this.
After finishing the Second Dream we gain the ability to use the Transcendence ability, the void chest-beam.
I always saw this as raw un-tempered power of your operator. And sure enough after completing The War Within you are able to jump out of your Warframe at will and you're given a Mote Amp which always felt weaker.
Why not bring a stronger, faster cooldown Transcendence back that we can use by holding down the Transcendence/Transference button?
Why remove the ability altogether after a single story arch? I'd like to think the chest beam can have some special damage value against sentients, giving it a real purpose.
Here's to hoping this gets signal boosted.