I know this has been posted in the past, but it's been over half a year since it's been addressed (to my knowledge) and we still seem to have this issue. I understand that having the rotation locked at an interval allows for a more consistent experience /help users align objects. However, some situations make this system result in really off-putting placements. The worst instance of this is the underwater condo, where the curved walls and weird shapes make it very difficult to place furniture in a way that looks natural. Furthermore, it seems that due to the way the rotation works and how the walls are curved, canvases placed on the wall in the underwater condo will not actually look straightened.
I propose that we add a hotkey to toggle 360° rotation. That way we can still easily align objects like before, but it also allows for better creative design space. Since this is such a huge issue for the underwater condo, maybe it could be bundled with that update?