I can absolutely see magic not being able to correct genetic or congenital conditions. It can make sense for developmental delays aswell. But something like missing a limb from a traumatic injurie or blindness due to macular degeneration... There is no reason a mid level adventurer or powerfull character would not just use magic to heal or fix it.
Maybe an injurie by a powerful lich, or since kinda of cursed weapon that makes it impossible to fully heal with anything short of a wish spell...
Poor people on the other hand, should absolutely have debilitating injuries and disabilities that will never be fully fixed due to magic being expensive.
AFAIK angina comes from the Latin word angere which means to suffocate.
Angina pectoris being suffocating chest pain, often accompanied by shortness of breath.
And Ludwig angina litteraly suffocating a person via swelling.