Bio-Trophies are good for 1 thing right now for me in early game - get 8-9, don't allow them to grow more. Then when you build a new colony resettle them to a new world and get main building upgrade and robot factory there. Build 10 robots, move bio-trophies to the next world. Maintaining 8-9 Bio-Trophies is not very hard or expensive - you have enough CG and food production for that much.
Bio-Trophies shine in mid-late game, when you can just leave them 1 or 2 planets and produce much more unity then other ME.
While I agree, that RS were nerfed hard, they also require very different approach now.
Before:
- grow as many Bio-Trophies as possible, resettle them on empty tiles, get your morale bonus from the start
Now:
- first build mineral/energy production, then develop science and alloys, and only now, when your empire have lots of everything grow Bio-Trophies