Another reason for wanting to stay as standard as possible, is to ease the conversion for future flight simulators. Right now, is really not the time for tricks and insanely custom stuff.
I wouldn't call runway lights "insanely custom stuff". You even made custom taxi edge and centre lights lol... And if you ever made custom runway lights, you could have used the same model.
You're not the only one doing that btw, I've been noticing some devs putting so much effort in the modeling of the airport and release it with default lights. From time to time, why not land on it. But when you plan to make it your base, and when you come back from airports with really good runway lights, it will become frustrating. I speak from experience with your own LSGG scenery, at some point I just stopped using it.
Of course, as you may have seen, it won't prevent the majority of gamers to buy your airport. It will only prevent people like me buying it