Safari is awful on the scale of being a 2nd tier browser like IE. It's the browser people use because they don't know any better, or because they don't have any choice.
Safari isn't a competitor with Chrome, Firefox, or Edge
Safari isn't a competitor with Chrome, Firefox, or Edge
I still use Chrome for google stuff (e.g. gmail, google docs, GCP, etc), but that's because google has chosen to make their own properties work poorly in other browsers.
What's incredible is that Chrome uses more CPU on Youtube than Safari. When playing the SAME video side by side.
edit: As an example, Safari is 2nd after Chrome in this ES7 support comparison: https://kangax.github.io/compat-table/es2016plus/