The poll is about putting up early chapters or not, but the majority of your post is about how it's a bad idea to work on several projects at once. There's already been a lot of discussion about the former, so I'm only gonna address the latter in this reply.
First off all, you base most of your arguments on speculations, and you're wrong in assuming that we don't focus on one book at the time. I finish translating one book before moving on to the next, and these are done ahead of time so that the typesetters won't have to wait for scripts. We currently have two typesetters, each working on a single book at the time. Once the initial typesetting is done, there's a period where they might start on the next book while waiting for feedback from editors, but that's again to assure that they always have something to do.
Gunma was finished first, but because of the sheer amount of text in that one, proofreading took a lot longer than it typically does for a regular book. We were also short-handed because of sickness, which delayed the QA process further. With nothing to do on Gunma, the typesetter started on the next book in the meantime. We decided to do release all three books at the same time since it was Christmas. This was a special occasion, and you'll probably see books popping up one at a time in the future, with the potential for some overlapping later on—for instance the chapters of one book being released across February, and a second one mid-February to mid-March.
Finally I'd like to point out that the chapters were released on schedule. Some were a few hours late, but that's because they didn't go live automatically—a feature we intend to implement for future releases. The only real delay as I see it was the download links being 1-2 weeks late, and that was mostly due to poor prioritizing, and not an overwhelming amount of work. We all agree this was a failure, and going forward, I'd like to see the downloads going up sometime between the next "release slot" (the date the next chapter would've gone up if there was one), and no later than one week after the final chapter.