It's becoming more common as people use aggressive blockers but the main reason to care about it is that JavaScript breaks fairly regularly. On LTE, I see pages where a simple HTML display would work but a JavaScript loader failed on first load generally a couple of times a day.
With uMatrix I'm often without the necessary script to load basic static content. I love JavaScript and PWAs, but many sites aren't an application so I don't want extra scripts running who knows what.
