> One less derailleur to adjust or have fail, so less maintenance.
Theoretically, this is true. Except that the derailleur that 1x design removes is the front derailleur, not well known as the locus of failure or maintainance.
Suddenly I realized that my front derailleur was merely a chain guide.
I was really unkind to my bicycles. Always trying to find a way to replace fewer parts. I've broken or worn out and replaced everything except the frame, seat post and handlebars on that bike.