Haha, very amusing post and well written.
I don't have an issue with the installer change personally. Whatever it takes to keep the Sigil development rolling along. And yeah I specialise in features that only mean something to me - that's why I love that in Calibre they can be written as plugins that only people who want the feature download it.
However that does require the app being engineered in a specific way, and plugins can only do "so much" so you still have to drive the core of the application for the masses. So my vote is go for it and steer the good ship Ligis as long as you can...