At $4mm in a market account (not 401k), you also have the option to take out margin loans at shockingly low interest. This gives you untaxed cashflow without touching your principal. 160k untaxed is a lot more cashflow than the same number in salary or retirement distributions.
But wanting to change your lifestyle when you retire is incredibly risky, especially if you're young without life experience.
Any misstep costs you a fraction of lifetime earnings, and there's no way to recover it.