I have an old Trek 520 I now use on a Kickr SNAP on Zwift just about 100% of the time. I find that on flat to rolling rides I am always on the big ring up front and the smallest cog on the back - the top gear on the 3x7 drive train. The Trainer Difficulty setting is on the default 50%.
Outdoors on flat to rolling I would rarely be in that high of a gear. Maybe big ring on front, but not smallest on back. Recently the chain started skipping, check the cassette and the small cog in back looks like a jack o’ lantern - missing teeth and sharp teeth galore. Checked chain wear - it is well within specs, doesn’t need to be replaced.
On any hills above 3-4% I’m downshifting already. Would increasing the Trainer Difficulty setting have any effect on flat to flattish roads such that I’d really only be in the top gear on downhills, which is more realistic? It is always described as only kicking in on inclines.
Once I replace the cog, I’ll just try it out but figured I’d check.