On Windows. Opening Obsidian by the icon always opens the last vault.
There is a workaround to pin specific vaults to the taskbar (See “Pin vaults in Windows taskbar”), but it is clunky and very manual. It also ends up with multiple icons on the taskbar.
Proposed solution
I would like to see the same behaviour other applications (f.e. word) has on the taskbar.
Right-clicking the icon gives a list of recently opened files from which one can directly select what to load when opening.