One side of my bedroom wall was a built-in bookshelf. We’re talking about 4m in length and 2m in height. Some shelves had double-stacked books.
But you are right; the logistics are nearly impossible. I moved out of my parents’ house in the mid-90s, but they still keep most of my books there for me. I have my own house and family now, but my wife threatened divorce if I “cluttered” our house with all the books. My hope lies in my kids inheriting my love for reading and bringing over my books themselves.
An e-mail platform doesn’t enjoy the same kind of network effect as social media, so there won’t be any social penalty for never joining or leaving it. Unless he comes with a compelling reason to keep an account there, I don’t see it taking off.