I used to pin a bunch of apps as my go-to in Chrome and the app dock serves the same purpose but also lets you cycle through any open windows for the app (e.g.

I used to pin a bunch of apps as my go-to in Chrome and the app dock serves the same purpose but also lets you cycle through any open windows for the app (e.g. if you have multiple Google docs opened you can just click the Google Doc button to jump to each opened docs) but there are also certain actions that can be performed directly from the app icon like how it works in Mac OS.