Thinking now, especially with todays rules and balances, i find hive node a little bit extra strong too. Yet still i do believe it could have easily been balanced, with higher cost and limited amount, maybe just one. And while some biomorphs are thought to be imbalanced back then, they "could" be taken, giving us the bio-engineering joy. It feels so limited now with our new codex, at least for me. I remember reading the codex first time, where biomorphs are explained. Reading tusked, bonded exoskelton, reinforced chitin, toxic miasma... i felt a surge of joy, imagining close combat expert warriors, only to see they could take none of it!