I used to think this about QRPs and was I wrong:
I personally don’t like these QRPs or qualified retirement plans (Roth-IRA, Solo 401ks, etc.) especially if you are an active real estate investor. If you are conservatively using prudent leverage and finding decent deals there is no reason you should not be able to retire in 10 years or less and thus negating the very reason for these accounts.
But now I see how this strategy is a great part of a holistic strategy. The key is blending your investment funding from both QRPs and your regular liquidity. The QRPs are for the future and the regular liquidity is for today.