When creating a new subtag in the sidebar by clicking the three dot drop down, the default is to not have "show in sidebar" checked. It would make more sense to default to checking this box. It's very easy to remove a tag sitting on the sidebar, but takes some digging and extra clicks to add it back on if you save and forget to check the box.
Yes please make this default to show in sidebar!! Every tag I make I forget to click that box and its takes another minute or two to update in settings. This is a big time waste for frequent tag users.