This is an awesome article, and as a founder of a SaaS company with 30 people I totally agree.
Furthermore, I use the same cashflow plan for my private finance as I use for my company's finance. If you want to get a step-by-step tutorial including the Excel template, you can get it here: https://tomvogel.gumroad.com/l/how-to-stay-on-top-of-your-private-finances