> To see this, get two people together and try to get them to agree on when capitalism started, or even what a country needs to be considered a capitalist country.

this isn't actually an argument but an appeal; just because laypersons don't know how to frame something doesn't mean useful definitions don't exist

  > As a naturally evolved system, the alternative to capitalism is therefore capitalism+some minor tweak.

thats not a strong argument; people could have said the same thing about feudal arrangements and slavery or kings and emperors at one time in the past