> just the default and probably(?) the majority
One can decide whether to respond optimistically or pessimistically to that reality.
> union/labor-relations sense of the words
I disagree that unionization fundamentally sets interests of labor against their employer. Sure, sometimes they diverge, but happier labor is more productive. Having a channel to communicate common grievances, so they can be addressed, is a key ingredient for also making labor happier and improving profits.
> my labor is creating profit partly for my own gain — so I'm not being exploited
You're rationalizing. Without equity, you're still gaining - it's called your salary. You don't actually get equity in early stage companies; you get options on equity, and even if you decide to pay money to exercise those options, you have no vote in board elections, dividends are highly unlikely to ever be issued, and you cannot sell your shares unless a highly unlikely exit (which you have no control over) occurs.
> If a small-time landlords want their tenants to overlook issues that they can't reasonably fix, maybe they should be offering their tenants equity ¯\_(ツ)_/¯.
A, not all landlords suck; it is possible to find a small-time landlord who cares about the property and finding a good tenant (my mother, who owns a studio apartment she inherited, happens to be one of them). If you don't like your landlord, you should consider moving. B, splitting equity in real estate amongst several / dozens of people is a really bad idea; since everyone gets a veto, the more people who get a say, the more unlikely it is to achieve consensus on anything from repairs to renovations to selling to a developer so that land which has a few housing units on it can have dozens or hundreds of housing units on it.