You can take decades old fibre, stick some new transceivers on the ends, and have it run at the very latest speeds (unless it's cheap, damaged, etc) without having to pull it out and reinstall it.

H100s will not age this well. It's not like owning old railroad tracks, it's like owning a fleet of 1992 Ford Taurus's. They'll be quickly obsolete and uneconomical in just a few years as semiconductor manufacturing continues to improve.