It is restricting my freedom and ability to buy more properties.

Condos are a better bet since they usually give you more freedom to rent and are easier to sell.

Achieving “work optional” status and creating a life with more freedom and flexibility.I’m excited to learn, share, and grow with all of you here at BiggerPockets.

PROS of a Solo 401(k) with no Custodian: 1) Freedom of checkbook control, ability to more easily move funds in and out of a bank account in the name of the Solo 401(k). 2) In some cases, lower fees. 3) Ability to more easily link your Solo 401(k) to bank account systems like rental property management systems, or if investing in real estate syndication platforms. 

Do you want time freedom? 

He could have quit when it became obvious these houses weren't helping anyone hit their freedom number except him and his partners.

Whether you should take a retirement distribution or not depends on several factors1) How much do you value the freedom/flexibility to ues the money NOW compared to when you are 60 years old.2) What type of return can you get having cash vs investing in an IRA / SDIRA.If you can make a 1% - 2% better annual return in your personal name, it may make sense as the added return will pay for the penalties over a couple of years.I personally cashed out of my retirement account back in 2016 and it was the best decision I made.

See this BP blog for a numbers comparison - More Units Doesn’t Mean More Money—Why a Single-Family Home Can Beat a Fourplex.Stay focused on your goal, financial freedom; not following popular dogma.

He was in the marine corps, he was one of the first people to invade Afghanistan during operation enduring freedom. 

While real estate investing aims to achieve financial freedom, this is only possible if you invest where rents outpace inflation and there is significant, sustained population growth.