The details of this question may end up being quite specific to my exact circumstances, but I think the information presented in the answers will still be usable and interesting for the general case.
Hopefully as shown by my activity on this site, I quite enjoy working on my bikes. Whether that means buying and installing upgrades, trying experimental modifications, making aesthetic changes, or even performing general maintenance, I am not afraid to get my hands dirty; in fact, I find it rather enjoyable. However, I plan on giving my road bike to my brother (I am moving across the country), who is not nearly as serious a cyclist as I am. Since I know he will put it to good use commuting, I want him to enjoy the bike, but in a way that doesn't require the maintenance and adjustment I currently perform. In other words, I want to turn the bike from a constantly-evolving performance machine into a reliable machine that simply takes the rider from point A to B. Light weight and speed can be traded away if needed.
Are there any technological modifications, adjustments, purchases, or changes I can make to the bike to extend service intervals or make the bike more rugged? Alternatively (or additionally), are there non-technological factors I could consider? For example, I am trying to teach him to unweight the saddle on bumpy terrain to avoid unnecessarily stressing the bike, and I'm making a schedule for chain lubing and tire inflation. The bike in question is a 2020 gravel bike with a 2 by 10 Tiagra 4700 drivetrain and mechanical disc brakes if that helps. I think answers would be better if written from a more general viewpoint though.
Also, am I heading in the wrong direction? Should I just sell the bike before making any drastic modifications and get my brother a different one altogether?