Most of us want to only spend very minimal time on each website to make it acceptable (and if very minimal time is not enough usually an acceptable alternative is to not visit the site at all). Thus adding uMatrix is not worth the effort.
I use these two and noscript. Temporarily allowing as needed, and further releasing control on elements if necessary.
What does Noscript do that uMatrix can’t? I currently just use UBO and uMatrix configured to block all third-party JS.
In case you didn't know, you can also block all 3rd-party JS with uBO.