On FF desktop it doesn't bother me too much, but on iPadOS Safari I was having quite a challenge editing a URL param due to selecting all on touch with no obvious way to switch to cursor mode (!).

My solution: touch to select all, touch again to reveal sliders, drag the (only visible) left slider to the right to reveal some unselected text, touch the unselected area to get a cursor, touch+hold to drag cursor to end of URL, edit URL, profit! I've seen easier puzzles in puzzle games!