Alas, EtreCheck is far from simple. Early versions were little more than a wrapper around system_profiler. But the current version is very sophisticated (~40K lines of ObjC, C, XSL, XML, HTML, and JS) and has some one-of-a-kind features. (see above)
If you try EtreCheck, you’ll find that it has nothing in common with system optimization scams. EtreCheck has no (or very few) magic “fix it” buttons. It only finds issues that appear to be problematic and (optionally) gives the user instructions on how to fix those issues. EtreCheck is definitely an end-user tool. It is designed for people who don’t know what software they have installed. It will even provide people with anti-scam tips if it detects that they might have installed scam apps in the past. For other users, it could still be helpful in listing partially uninstalled software like what is being discussed with the Zoom issue.
The latest version of EtreCheckPro 6.0.2 has more features that might appeal to very tech-savvy users. It has a storage analysis feature to help find how your disk is being used since Apple’s own tools are notoriously bad at this. It also has a graphical view of the analytics data that macOS automatically collects. You won’t find this analytics display in any other tool.