A topic close to my heart... I like the simple equation at the end - tbh I didn't need the definitional reminders of what assets and liabities are.
You might be interested (you might not be, you write like someone that's financially sorted already) in J.L Fisker's Early Retirement Extreme - in which he presents a very sophisticated analysis of different types of asset (financial/ physical (health)/ saleable skills/ social networks - and the importance of investing in each.
It's a great read.... Fincancial wealth is but one form of capital that we can draw down on in our 'twilight' (or in my case early afternoon), years