What's the story with kite-reeling?

In Sebastian Rapp’s PhD defence he makes clear that you can rapidly predict trouble ahead and avoid it in systems with known flight behaviours… and from the work of @ufechner Yo-Yo can release / reel-out the winch faster in generation as a protective measure against overloading the blades or tether during a gust (as well as flying higher elevation closer to to the edge / zenith)
This flying faster outward slows the apparent wind

Some remaining control questions seems to be
how to make sure you can’t outrun the total tether length (sounds easy enough)
how to avoid shock loading in transitions especially with larger tethers (not easy)
how to account for tether wear & frame fatigue (think that’s quite well looked at)
how to use multiple kites on 1 Yo-Yo system
are large scale single kite Y-Yo flights even viable
… add your questions