Deco and Rec Diving: I am 100% a rec diver but a little "deco" can happen. Was diving the spiegel with a DM who I guess has a more aggressive dive computer. Choice was to leave guide during a swim through on the Spiegel or wait until I was out and could see the line to the mooring ball, then leave DM and do my deco on the way up. I chose the latter. If I am later in a dive and see somebody who needs some help, I will do so as we head up. If it puts me a little into deco I will deal with it on the way up. I have plenty of air.
Also this is real world. Had an instabuddy on an offshore ledge who teamed up with me and regular buddy. Turned out that while she was very comfortable in the water and good on air she was not used to thinking about NDL since her usual buddies were air hogs. She was on air we were on nitrox. Later in the dive I looked at her dive computer to verify that the signals she was giving were correct. So she had recently gone into deco. We signaled time to go up and lead her through her stops and saw that she cleared her computer. She got a lesson in NDL and computer reading during the SI.
Point is that I agree rec dives should avoid deco when possible but stuff happens, you meet people. that do not remember their training from years earlier, and you have to calmly deal with it. During our predive discussion it never occurred to me that a diver with 50 dives did not remember about NDL.