To be fair the extension developers were given quite a while to update their extensions to use JavaScript modules instead of the custom GNOME solution. This was actually a change for the better and unlikely to happen again which should make extension development easier. As for better tiling look up their mosaic thing which was announced a while ago, though I’m unsure as to how soon that will come out.
Also try to remember that GNOME is developed mostly by volunteers who frankly owe you nothing