When you have created Components and you figure out later that they are used always in a bunch of e.g. 3, or you want to prepare a one-time-drag-and-drop experience for the editor even though several components are involved (like in a header or a footer) then the component renderer (introduced with SXA 1.8) is a good solution for you.
Even though SXA is there since many years, adopting towards SXA seems to be a very slow process. When I heared of SXA in 2016 for the first time I directly fell in love with it. I managed to introduce it to a Multisite and Multilanguage Project end of 2017 and by working with it, I became an ambassador for SXA. Let's check out some material I recommend to see before getting started.
See the Symposium 2019 talk of Natasha Batra and me (rerecorded) how Metronom developed a Multisite Solution at scale and walk through how we utilized the greadt potential of SXA to accelerate.
