For normal people, MMM strategy is about making uncomfortable decisions (plain, reliable used cars, no fine dining, no fancy houses, no downtown-big-city living locations) to avoid the most uncomfortable thing of all: work.
If you would rather have a job your whole life so you never have to eat a bean or drive a 20 year old car, you're not the target audience. People who are driven to early retirement & financial independence are people who DESPISE jobs and are willing to spend their whole life at a much smaller income bracket in exchange for not having one.
They don't want your new devices, cable tv, leased cars, and downtown apartments. They agree those things are nice, but not nice enough to take on an extra 40,000 hours of "servitude" with an employer.
The strategy is simple: if you can live on 20% of your income, and save the rest, then in a few years, you will have the ability to reproduce that same income indefinitely. The amount of the income doesn't matter, and that is being lost here for some reason. If you can't do 20%, you can do 30% and a few extra years. Or whatever.
The MMM strategy is about ditching the job, and balancing the trade-offs to something you can stomach. If you can't stomach it, fine, but that doesn't mean it's not a viable strategy.