My current harness has these single-piece buckles:
It might be due for replacement in one or two years, and I really like these buckles, since I can completely open all parts of the harness if I need to. Also, I heard friends complaining about their harnesses (with other types of buckles) becoming slightly loose while wearing them.
I am having a hard time finding any new harnesses with that type of buckle. Is that kind of buckle considered obsolete? If so, what is the reason for this?
Is it because you basically have to double check your harness to be sure that you have correctly fixed the buckles? Or are there other reasons that might make them unsafe?