Should you leave money in 401k after retirement?

Could you please elaborate on the advantages and disadvantages of leaving money in a 401k plan after retirement? Are there any tax implications or penalties that retirees should be aware of if they decide to keep their funds invested in their 401k? Additionally, how does this decision compare to rolling over the funds into an IRA or another retirement account? Are there any specific scenarios where it would be more beneficial to keep the money in a 401k post-retirement? Thank you for your insights.