Not many users may encounter this but I do on regular basis. This alert likes to hide behind other windows and there is nothing else to indicate that the user already started Studio. Hence it can easily happen that Studio is started twice or even more often, thereby potentially locking files and/or other resources which can lead to all sorts of calamities.
An icon on the taskbar for this alert would show that there is indeed already a Studio instance running. It is an easy fix.