As far as "a smaller snake could have issues", any female with eggs can become egg bound and die, or purge the eggs/follicles whatever it's called and die, at any size, at any weight.
I don't feel like I've seen young/small pythons having issues being bred at a smaller size. I don't do it by my own choice, and I'd feel like a hypocritical idiot trying to dictate what size a female has to be, or how to best feed anyone else's snakes. I don't want anyone telling me that breeding a female under 2000g is stupid and risky and I won't run about telling other people that feeding every 2 weeks is wrong on their part.
You are welcome to run about the internets, judging how everyone else keeps their snakes, and how you feel they should be doing it instead. I'm certain you've got plenty of experience to advise everyone with. Just don't be surprised when you get shot down when folks don't appreciate your pushy tactics.