A 401K, 403B, SEP, SARSEP, and more letter combinations than I have the patience to list here are all types of 'Qualified Plans.' They are nothing more than savings plans with a government regulation wrapped around them. Once a Qualified Plan is established, any activity related to that account is subject to government rules and regulations. By the way, those rules and regulations can change.
What can also change is the tax rate you are subject to and must pay when you pull the money out.
Raising taxes changes all the math. If that happens, the current wisdom of putting money into a 401k, IRA or any other type of Qualified Plan could backfire and become a better deal for the government than for you.
Sometimes a Qualified Plan can be a good fit, sometimes not.
Alternative plans do exist for many individuals and business owners.
Isn't it about time you compare financial ideas with me?