It really is the Dems on this one.

I'm not sure you understand how Massachusetts politics works (or perhaps any local politics). I can't speak for the other states with in-depth knowledge, but boy can I school you about Massachusetts.

Federally, we're a deep-blue state, but that's just not all of how it works at the state level. With a few exceptions we usually have a Republican governor. Yeah, the rest of the US like to call them "RINO" because the're not on board with the craziest shit the alt-right has to offer. Most (if not all) of these changes happened under Romney and Baker, both Republican. Of note, none of these changes I'm talking about have ever shown up in a bill in legislature. They've all be driven by the executive action upon the mandate. That is, they fall on the governor. Who was Republican.

...and yet, I didn't say it's The Republicans, either. Democrats could've stepped in by passing laws preventing that behavior. We didn't because our Democrats like to keep peace with our Republicans and, frankly, because the Democrats don't care enough to involve themselves in the HOW as long as subsidies are happening.

But Dems aren’t following through with what they say they want to do–affordable housing for all

Again, I can only speak for MA. With one very recent exception (and excepting the recent excessive price spikes), MA does fairly well with providing affordable housing for all as long as it's outside of Boston. But I think I wasn't being entirely clear. I am mostly talking about Housing Project availability. Section 8 is, as you suggested, up to the landlord. It's worded to allow people to live basically anywhere, even in the heart of Boston, with a limited income.

BTW - section 8 should be great for a landlord. You are guaranteed payment on the 1st of every month, and you can still initiate eviction if the tenant is trashing your property or doing crime

From family experience, the issue is that "trashing your property" can cost you years of profits or even force you to sell the building. I've had family deal with the notorious "cement in the toilet" meme for real. People really do it and it really costs a massive amount of money to handle. Home and landlord insurance does not cover intentional damage by tenants. We're talking up to $15,000 damage just because they're mad you're evicting them.

Most landlords don't care about "not wanting poor people" with Section 8. They care about having judgement-proof tenants who can cause damage and never be held accountable due to being poor. They also have to meet certain building code and quality standards that non-section-8 landlords don't! There's a LOT of non-section-8 rentals in New Bedford for this reason. No, they're not trying to gentrify Durfee Street, I promise you that!

There's two sides to the section 8 coin. Side 1 is that the rent is slightly above-average and some of it always shows up on time. Side 2 is that the rest of it is often late, overall risk is higher, and then you actually can't be a slumlord. I mean, look at the list of rules. Everyone I know living in New Bedford apartments have (checks list) shitty or broken HVAC, decaying building foundation, crappy interior stairs, pest issues, flaking paint, etc. Not only can landlords get away with a lot of that (and worse) normally, but Section 8 includes annual and spot inspections for all of them.

I don't fault the state making these demands, but it leads to a lot of people not registering their rental with Section 8, for reasons that have nothing to do with Poor tenants (and in many cases BECAUSE they're going to have poor tenants who won't pitch a fit about a not-to-code apartment). I've rented from places that would have failed Section 8. And I kept my mouth shut.