The biggest thing I see unmentioned is the ERISA protections. Do not turn your 401(k) into an IRA before understanding the implications of losing that protection. It's a safety mechanism for your future self.
The IRS website is pretty vague on what the implications are besides providing "protections".
[1] https://www.irahelp.com/slottreport/how-safe-creditors-your-...
[2] https://www.investopedia.com/articles/personal-finance/04071...