You may already know this and it’s a conscious compromise. If so you can ignore it.
When trying to add a new thing I am unable to scroll to those items lower on the list.
When trying to edit a tile, the edit dialog will appear at the top of the screen meaning I have to scroll up to get to it. Not usually a big deal but in Edit mode if I touch any of the tiles it will grab the tile and attempt to move it vs scroll the screen. You have to try and touch the screen between the tiles in order to scroll the screen, quite a small target.
I would think that while the Edit dialog is up that tiles could be frozen until the edit dialog is closed.
I don’t do any major editing on the iPad but occasionally I might wish to add a new tile or edit an existing tile. Until re-organising tiles becomes easier I would not attempt it on an iPad.
P.S. I’m using Chrome on my desktop and iPad for syncing of bookmarks.