How are everyone's A1Cs so good?

It sort of drives me nuts that it seems like the majority of folks on here have unbelievable A1Cs and claim it is easy. According to a 2022 NIH study, only 23% of T1s have A1Cs below 7%, so how is everyone under 6% and many in the 5s or even 4s with little to no effort? Is this just the Instagram Effect? Are they cherry picking that one incredible A1C, like that one time I got a lab result that (likely erroneously) said mine was 3.7%? I personally am generally around 6.0%, but it takes way more effort than I can imagine most people are willing or able to put into it. That's all.