Edit: Changed title to be more accurate.
Also here is the summary from Wikipedia on what Post-scarcity means:
Post-scarcity is a theoretical economic situation in which most goods can be produced in great abundance with minimal human labor needed, so that they become available to all very cheaply or even freely. Post-scarcity does not mean that scarcity has been eliminated for all goods and services but that all people can easily have their basic survival needs met along with some significant proportion of their desires for goods and services. Writers on the topic often emphasize that some commodities will remain scarce in a post-scarcity society.
That’s pretty fair. It may feel impossible for me today to afford any capital, but if I were somehow able to accumulate enough money I would be legally allowed to own capital. Under monarchy, even if I got that much money, it would be illegal for me to purchase capital as an individual. That’s enough of a distinction to make them different for me, thanks for bringing it up.
Yep, that’s the idea! Functionally, Capitalism is more revolutionary and progressive than Feudalism, which is why it’s a good thing that Feudalism is fading and Capitalism is the status quo, just like it will also be a good thing when Capitalism is fading and Socialism becomes the status quo.