Residential demand being negatively affected by homelessness is one of the issues we're currently testing a fix for.
I don't have a list of bugs we're currently working on that I can share as we don't want to promise fixes that may not be ready for the next patch. I can share that we follow the discussions in the community to make sure we prioritize the issues that affect most players or cause the most headaches, but of course available resources also come into play here.
As for the zoning system, it's unlikely to see a massive overhaul that completely changes how it works. Such a change would very likely break existing cities, something we try to avoid as much as we possibly can.
I assume we're talking about the zoning grid being slightly off and not creating perfect blocks. This is an issue we're aware of, but unfortunately, one that's rather complicated to solve. Because the road tools allow so much freedom in where and how you build your roads, they can end up with very tiny offsets that affect the grid. So the road that looks to be 100 meters long may in fact be 100.01 meters and that little .01 is enough to offset the grid on one road compared to another.
I can't promise anything here as a fix may not be feasible and we currently have issues that would be a better use of our resources to fix.
That's wonderful to hear!