And if something goes wrong and creative decision making becomes critical, what then?
I just don't get why you're making the dive if you have to do it with severely limited cognitive functions. I dive for fun. I want to really remember the dive. I want (for myself, my family, and my teammates) to know that I'll have a very clear mind when the stakes for bad decisions are great. I want to be able to make VERY creative decisions at maximum depth (complex navigation, limited vis, dark water, running line, scootering, avoiding entanglements, tracking deco, shooting video, keeping the team together, accomplishing tasks, making penetrations, etc).
I guess it comes down to what you hope to get out of the dive. I'd be bored silly if I had to "manage" narcosis and limit myself accordingly.