I'm not sure what you are trying to say. I don't support rent control either, but I suspect there is still money to be made building rent control in-laws in these boom times - and perhaps even more money to be made putting in-laws on Airbnb. Also re: ADA the point that the new in-laws are generally on the ground floor seems to me a plausible reason why ADA-compliance may be easier than otherwise.
I agree that's how it looks from proposals, I think you have articulated the politics in a helpful way.
> idea being the new in-laws are hoped to contribute to regular (mostly rent-controlled I believe)
No, the idea is to increase specifically rent-controlled stock, with the preference of no new rental space at all over new rental space that is not rent-controlled. At least this is how it looks from the proposals.