Who defines maximum comfort? My dad and I are roughly the same size, but we have different ideas about how to adjust the driver's seat! Some cars let you save seat positions, that's definitely the happy medium between starting from scratch every time a new driver gets in the car and a very expensive automation procedure. Now, I agree, pie in the sky, that might be a cool feature to have, but one thing to note is that designers have constraints, like time & money! Driver's seat adjustments are easy to make and happen infrequently compared to most other tasks, so, and this is another thing to note it's probably better for all involved that the design resources be spent on things that would get used more often, like the AC/radio controls, info display, etc.

Now, your office chair's only purpose is to be comfortable for you. There might be some argument for automating the ergonomics (if you can fit it in your budget, of course), but then again, is it worth adding all that cost & R&D for a feature that will only be used once? Maybe if you're targeting a premium market, but likely not. A part of design is thinking about these tradeoffs and working within constraints...