I’m using Obsidian for tasks (yes, still), but I don’t think it’s for most people yet. I will explain how you’d get @MitchWagner’s two bullet points below though.
I celebrate Todoist. I used it for years before OmniFocus and it still tempts me. If it works, stick with it.
Also worth a look:
Adding tags to tasks in Obsidian is literally inline, so that’s that.
To do grouped priorities, you’d set up an embedded search. Something like
task-todo:(tag:p1)
will get you all incomplete tasks with the tag p1. Although I think I’d recommend doing nested tags like p/1, using p as a first level, because then it’s easy to find all priorities and tasks that are not prioritized.
Again, not actually advocating for this solution. Just a thought experiment for me. 