My evergreen solution to financial planning:
Make more money.
Owe the dentist?
Make more money.
Tax-man coming for you?
Make more money.
Leasing a much too expensive car?
Make more money.
It's not conceptually difficult to set a plan, but making it happen is where some people (including me) fall down without some help.
It comes down to your relationship with money and your habits around it. If you've already got a good relationship/set of habits, that's great. However if you have a tendency to empty your bank account at the first sign of something exciting to do/shiny to buy, and then wonder why you're broke 6 months later, a tool like this is useful.
I can see where people falter. However, then it doesn't have anything to do with money and intelligence... but rather self control and discipline.
Perhaps give money to someone you trust every month. Tell them to only give it to you in case of emergencies. Seems easy enough?