I, like you, had no idea about that. Thanks for the video.

When I went from friction type shifters on downtube to indexed gears many years ago I wondering about this. As if reading my mind, the guy at the bike shop explained it to me but he called it “feathering” which is quite descriptive.

Didn't know it was called trimming but I use that all the time to make small adjustments on my front derailleur with Shimano 11sp Ultegra.

Thanks for the reference for Red Panda, and btw I love the sunglasses !

Never heard of "trimming" on a bike, but then I have a 1x drivetrain.

Give it 5 years and the front derailler will be gone. 1x all the way.