I don understand how my mom had and my aunt has way more chickens for way more years and never had all these issues. Actually they have never had any issues.
I don't understand what they are doing so different except they bought from a hatchery and i bought from a farm.
Buying from a hatchery might be part of the difference.
For example, hatchery chicks do not arrive with lice. And hatchery chicks are usually the sex you order (at least mostly).
I can think of some other things that might be different:
They might house the chickens differently. Bumblefoot, broken toenails, and frostbite can be more likely or less likely depending on how the chickens are housed.
They might feed or tend the chickens differently. That could avoid the grass digestion issue and the issue with not handling the food.
They might have different breeds. That could prevent frostbitten combs, and maybe some of the reproductive issues.
They might have some problems that they haven't told you about, because they deal with the problems and don't think it's a big deal. For example, some people consider extra roosters a big problem, and other people happily have fried chicken for dinner.
They might not pay as much attention as you do. So they might not have noticed if their chickens had lice, bumblefoot, undigested grass, broken toenails, frostbitten combs, and various other problems (now or in the past). Some of those things can heal by themselves (like most cases of broken toenails), so if they did not notice at the time, it might not be obvious now.
And if they live in a place where roosters are allowed, of course they would not be forced to get rid of roosters.