I don't have any logbook need for more daytime VFR instruction (whether I have competency-based need for day VFR instruction is unlear).
so if I want to log night hours (for a NVFR rating or CIR, etc) being able to start the clock at 5 minutes before last light means that everyone potentially goes home 5 minutes earlier. Win-win.
it's pretty dark at 5 minutes to last light anyhow so it's not as though I'm cheating myself out of taxi practice in the dark.