That is a concept everyone can and should get behind.

Each has its own advantages and challenges, and success depends more on the specific property, location, and your management approach.The "forever apartment" concept rarely exists.

I am pursuing a few larger companies myself as I am building 3 different ADU projects this year, but I haven't really gotten started enough with any of them in order to give positive/negative feedback.Do you have financing already setup for your project?

You'll see plenty of people posting about the negatives. 

However if this is an appreciating market, although your monthly cash flow might be neutral or negative, you may over time actually have what we consider phantom cash flow, which is gained through appreciation and tax benefits. in most cases, if you need true “cash flow” use the simple one percent rule.

Take what you hear from @Mark Miles with a grain of salt, he has been reposting the same negative info on the Poconos for more than 3 years now.

Nothing to add here beyond simplifying the concept. 

-What references are going to give negative feedback?

using the bank to agree to a set amount of stock that they will accept as adequate and that negates the wide swings you talk of.

And if you have a property and a loan out there, and you are cash flow negative because a recession hits and rents are dropping, AND values are ticking down month after month, how long are you going to fight through, especially as a newer operator, before you call it quits, take your lumps, and move on.At the end of the day, there is money out there.