The concern was quality, too. Yes, I thought about Electron, hell I even made a prototype for that. But in the end quality counts (to me), not speed of development. I knew that I had lots of time on my hands (no investors or anything, just my own money).

I didn't have anything to lose. So if you have the chance to make it perfect (versus taking some off-the-shelf tool and possibly ending up with a PDF that isn't quite what you want), would you risk it?

Self financed, quality before speed of development, no investors that need to be impressed. Awesome, more people should do that!