Rather than Obsidian always opening the last vault that you had open when it was closed I think it would be helpful if there was a toggle in the settings to either behave as it does now, or always present you with the screen that is shown when you click on “open another vault” so that you can choose where you want to start.
Currently if one has multiple vaults that they’re frequently shifting between, it creates an extra step to have to manually open the vault that you want & then close the one that opened automatically.