I was playing Bohemians today and wanted to use the hotkey (default is F) to queue up the Houfnice upgrade. However, I noticed that it was queueing up Siege Towers instead, which is obviously not what I wanted. I thought I just got the hotkey wrong, but I saw what the hotkey was and pressed it. Siege Towers again. I then checked the Siege Tower and discovered, to my horror, that they occupy the same hotkey by default.
This is obviously a huge problem for people who play with default hotkeys, as the normal hotkey doesn’t even default to the Houfnice upgrade, which is obviously way more useful than the Siege Tower.