I agree that most today are on a subsistence lifestyle.

But gonna have to disagree with “we’re at modern serfdom” in the sense that medieval serfdom existed. There are LOTS of economic barriers to picking your life up and moving somewhere else, to changing what you do for a living, etc; but there aren’t legal barriers. That is, if you decide to move or change jobs, you could land yourself in lean times, but no one is going to chop body parts off you or lock you in a dungeon for doing it (as could happen to serfs in the long ago.

Additionally, if you’re one of the lucky ones who does manage to buy a place, it becomes a financial asset. If you have kids, it can be passed to them, at which point they an sell it to go move themselves somewhere else. Contrast this with the typical depiction (which I assume is at least moderately factually correct) where your kids are now tied to the land you lived on.

Unless you mean to speak of serfdom to the government who can control your ability to travel (generally I mean internationally, but some nations do restrict intranational travel), who take a portion of your wealth on a regular basis in the form of taxes (thinking property taxes, but I guess could be applied to income and other taxes), and who can lock you up in a “dungeon” (prison - and for relatively arbitrary/subjective reasons).