@ryanjamurphy While I’d love to think that a consolidated system such as you describe would work, I suspect that it depends on the complexity of one’s responsibilities and tasks. I have no idea what you do and your responsibilities may well be broader and more complex than mine but with that caveat, I don’t believe I could implement such a system effectively—though I’d love to think I could. 
Here’s why.
I have to manage a large number of relatively complex projects across multiple departments, I don’t see how a simple task system like one in Obsidian can handle that complexity. For example, I need to be able to defer, repeat, tag, and flag projects and tasks on a ongoing, evolving basis. I need to send emails into my task manager as a way of adding tasks, accountabilities, etc., to projects. I also need the ability to look at the present and into the future for tasks coming due by me or others in a bird’s eye view and be able to filter those views by person, project, urgency, etc. OF gives me those abilities through perspectives, tags, forecasts, etc. It may be that I don’t understand the possibilities in Obsidian or a similar program but I don’t see how Obsidian can handle that complexity. Even if possible, it seems to me to require substantial tweaking and customization to make a note app work as a task manager whereas OF (and other task managers) is designed specifically for that purpose. The beauty of a program like Craft for projects notes is I can highlight a heading with its tasks and share those to OF. OF keeps that structure in place and I have a link back to the note in Craft. Everything is integrated but I have the power of OF at my disposal.
What do I have wrong in this assessment? I’m an minimalist at heart so I’m genuinely interested. 