And an inherited 401K is considered income. I'm not sure what you're arguing here.
Options for an inherited 401(k) if you are a non spouse beneficiary
Take a lump-sum distribution
Non spouse beneficiaries can receive their portion of a 401(k) account as a lump sum with the same guidelines as a spouse beneficiary. Note: Once a lump sum is taken, the 401(k) balance cannot be rolled over.
A spouse can receive their portion of a 401(k) account as a lump sum, penalty-free. The IRS taxes lump-sum distributions as ordinary income (except for any Roth IRA that has met certain requirements2), and, depending on the account balance and your income level, this could create a substantial tax bill.
Roll over funds into an inherited IRA
Non spouse beneficiaries can also do a direct trustee-to-trustee transfer of inherited 401(k) funds into an inherited IRA, following rules similar
to inheriting someone's IRA. The IRS waives any early withdrawal penalties for owners of inherited IRAs so they can withdraw at any time.
Some rules about this option: First, the non spouse beneficiary can't make additional contributions to an inherited IRA. Second, unlike a spouse beneficiary who has a more flexible schedule to empty an inherited IRA, certain non spouse beneficiaries will need to withdraw all funds in an inherited IRA opened after January 1, 2020, no later than 10 years after the original account owner's death. IRS regulations require RMDs during the 10-year period to be taken at least as often as they would have been taken under the original owner's remaining life expectancy, (as opposed to inheriting before RMDs commenced, which would allow not withdrawing any money in years 1–9, then draining the account all in one go in year 10.) Thus, if the owner was age 73 or would have reached age 73 during the 10-year period, the beneficiary must take RMDs accordingly within the 9 years and take the final distribution in the 10th year.
The penalty for not emptying the account within 10 years is 25% of the remaining account balance, which can be reduced to 10% if corrected within 2 years.