How far is "as far as practicable and possible"?

I see it all the time when someone needs to justify a compromise on animal exploitation including cases "if you need to eat animal products for your health, do it, you are still vegan". Serious question, who decides what's practicable and possible? Vegan king? Vegan society? Each person for themselves? Why isn't it applied to make compromises on human exploitation? I would argue that it is not practicable and possible for disabled people to care about themselves therefore it should be acceptable for them to have slaves. Yet, no one would allow it. If they can't afford hiring a caregiver and paying a living wage to them they have to... figure it out. Like, really, wtf is with this definition of veganism?

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u/The-Wraith-13 — 2 months ago