@Christopher Stacy
You make a lot of assumptions in your post which I think are leading to your analysis paralysis. REI is a numbers game and the BRRRR method really relies on the refinance aspect since without getting enough of your money out you have to wait to get another property.
People dwell on this and everything but I feel as it is the same thing as flipping. If you can't sell a flip for what you are projected then you also will become stuck financially, the same way a refinance hinders you're BRRRR empire.
Wholesalers need a return on their mailers and other forms of advertising to stay in the business and be able to scale. If you're not getting the right return, then your business suffers.
If you can't scale your business effectively then the growth will be stunted. It doesnt matter if you use the BRRRR, flip or wholesale. It isnt even REI specific. Every business has the same issues at real estate investing.
As far as the debt worry, if you're not into risk then you wont be able to scale as quickly as people who do not mind it. Every business has debt. Amazon has enormous debt. Tesla is a giant bundle of debt. A business owner who rents a warehouse, has inventory and pays employees salaries have debt. If you're worried about carrying debt then REI will stay as a way to help with you're retirement. If you want to scale a REI empire then debt is your best friend. This assumes you dont have bottomless pockets of money.
Just my opinion!