They actually were a single footpath from Dường số 2 to Nguyễn Văn Linh before (you still may see the old way on the right where I haven't added buildings yet). I split it because they aren't a single path. And then I detached them from the roads because they end at the sidewalk (and I wanted to minimize intersection points).

But the sidewalk exists only next to the park, so I agree, it makes sense to connect them to the roads as you suggest. So go ahead. The geometry of the paths is somewhat arbitrary, I only made them resemble the real ones.

My main concern there is the straightness of the roads, it's so easy to mess up the more nodes you add, but I can fix it later if necessary :)