Of course I did some post-processing, didn't really help - for me - as I wrote.

But just take the category "browser usage" as an example.

Semi-relatedly, one reason I hate web apps for "persistent" things that should be standalone, e.g. stuff like Slack or E-Mail. Not only does it not fit my mental model with alt-tabbing, it also lumps this uselessly together like "GUI usage vs CLI", so broad is "browser".

Window titles are recorded by this script. I wonder if you noticed this? You could have pretty decent filters with those, e.g. you can get a result for "time spent reading comments and writing on hackernews". If I use slack in the browser, i can even get the time i spent talking to different people / channels.