Checking for usability is one of the key parts of design iteration, which is done by product engineers. Source: am product engineer

I feel like hosting your own Obsidian vault is still the way to go.

Isn’t this similar to the tech used in fiber optics cables? Or am I way off

I’ve tried Thunderbird and wasn’t convinced… My work life is basically email, and I’ve tried several email apps over the years, a lot more than most people. I’ve found Postbox on desktop and Spark on mobile to be the magic pair for me so far. Unless Postbox fails me, I don’t think I’ll bother trying anything else anytime soon… Though I’m open to suggestions for mobile, since there’s room for improvement with Spark.

I’m assuming US? That’s a pretty cool way to do it. Where I’m from there’s a few private shops that will print on demand and have it delivered. Unsure of the prices though