Over the past year, I have been gradually abandoning the other apps and tools I have used in my daily workflow, and replacing them with Obsidian. I am not sure I can do this with my calendar, however. This is quite devastating to me because calendars allow me to see how I spend my day at a glance, and therefore, are an essential part of my productivity system. I would love to know what your experiences have been with the full calendar plugin, or with using Obsidian as your calendar in general.
I get not wanting to use a lot of plugins in case they go away. But at some point, trying to not rely on anything gets counter productive. Be realistic in what you are going to use by all means. If the plugin has a large user base, it’s unlikely to vanish overnight.