I agree with this. I see so many boas achieving massive sizes at only a couple years old, and I think that it seems to lead new keepers to want to raise their boas up fast. Yes, you'll get a big animal, but I don't think it's healthy at all. I also see a lot of these large, fast-growing snakes dying much younger than those brought up slowly. My best friend's oldest boa is 20 years old now, and has been on a conservative feeding schedule her whole life, and still healthy and active.
I also keep my girl on a more conservative feeding schedule, and she is more muscular and active than other boas her same age that have been grown up too fast.