That's an excellent point. I should point out that I didn't get into tech diving because I wanted to dive deep--I just wanted to spend more time at 100'. The rest was just a slippery slope
^ This.
I didn't really enjoy 100' dives until I took Tech 1. Now give me a bottle of O2 (40's are easy to schlep on land, and they just disappear underwater) and it makes the whole dive so much more relaxing. Want to stay another 5 minutes? Sure, you've got a few hours of bottom time left. Plus I feel better afterwards.