Hey Marc - Great question. Like you said.. to each their own. I was in a very similar position in late 2019. I was fresh out of college working absurd hours as a CPA at Big 4 and had very little time to sit down and learn. However, 6 properties later (roughly 2.4M), I can confidently say that I am very happy I didn't go down an institutional path like Roofstock, Rent-to-Retirement etc
There isnt anything inherently wrong with going down a more prefab route like Roofstock if that is what makes the most sense for you. That being said, regardless of how you approach investing...you need to know what your are buying, where you are buying, and why. Otherwise, this will be a costly lesson either at your own hands or the hands of others.
As much as I love a good spreadsheet, a formula cant decide that for you since a formula doesn't compare apples to apples. Roofstock's one-pagers cant either. You have to take into consideration things like neighborhood quality, deferred maintenance, common property issues in the area, appreciation potential, historic rents, city planning etc. which is why having a local market expert(s) is crucial.
Personally, I just spent a little bit of intentional time each day on what I wanted to focus on even if it was just 10 minutes. There are thousands of resources but if your goal is to buy multifam units... I would focus my "learning energy" on where you want to buy, how you plan to finance, and what you want your return to be. Once you have that nailed down, you can leverage the knowledge of a good real estate agent (preferably one who has done what you want to do) who can help you fill in the knowledge gaps.
At a bare minimum, you need to know enough to be able to weed out a good deal from a bad deal.