Well, it's not balanced if the drysuit can't provide enough lift for you to swim up the rig. That's difficult to achieve, but technically doable I guess.
Also, there's nothing wrong with technical dives in a wetsuit. You just need to be careful about weighting. AL80 doubles with trimix and a couple deco stages are still reasonably easy to swim up with an aluminum or CF plate. Longer exposures where you're dragging more gas or more deco bottles are probably going to be extensive enough that you'll want a drysuit, but you can easily and safely do trimix driving in a wetsuit.