Regarding your last sentence, I assume you are thinking exclusively of able bodied people, correct? Otherwise it seems like you're defending letting handicapped people "out" (aka die without resources)

And how would you achieve a meritocracy when the family you are born into and luck have such a high impact on your economic outcomes?

Btw would you agree with the old saying "from each according to it's abilities, to which according to its needs"? Or would you prefer "from each according to it's abilities, to which according to its labour"?