For websites tracking with use google tag manager or other tracking tags. However, sometimes they get removed (updates, other scripts, something else) and break Google Analytics, conversion tracking and more.
I would like to see a feature were you can configure your GTM and/or Google Tag ID, and it will do a check if that code is on the website. If not, it will show up in the dashboard.
I would very likely upgrade to a paid plan if this was available.