I know where my complacency started.
We were digging out a channel for a pipeline and my inflator hose kept leaking, so I bought a new one. In about 10 dives that one got gunked up so I stopped using the power inflator at all.
Next phase of the build was laying down some mats for the pipe and we had to use full face masks with communication. As I found out taking off the kirby to inflate was a major pain in the ass so I droped of some weights, bought a old style 2*10 twin set that has minimal changes in buoyancy and took the bcd out of the equation.
We were doing some long deco times and I noticed i'm not missing the bcd a bit so now unless I'm doing something with multiple stages I no longer carry a bcd at all.
Makes the dive guides go bananas.
I'm gonna guess that my complacency will stop once I realise that regulators are optional too.