1. Anybody who can work a computer can print to pdf and catch (most) font loading issues - and thus review before uploading. About 4 mouse clicks. Even with this, I had one hyphenation failure.
2. You didn’t mention ordering proof copies at cost - much better for many of us to proofread a physical book (after correcting errors on screen). Only takes a few days for delivery. Either way, read each page three times - but only one page at a time (get up and do something else for a minute in between). Read each word separately to detect typos - or you’ll end up just reading the story - which is a different focus and should have already been done prior to this final go through.
3. Your payout percentages are incorrect on sales of paper copies. What is it - something like 45% of list price?
4. A huge advantage over the old way is that there are no up front costs and you can later edit (I found additional important source material after publishing) - again at no cost. Paper copies are print on demand - a buyer orders a copy and amazon prints, bills, and ships. Totally hands free for writer.
You are right. I didn’t mention proof copies, nor did I mention a differing royalty structure for print.
My focus for this post was for e-books.