UI designer/developer here. One who works on features that facilitate reading.

Based on their writing style and the text highlighting habit, this person is likely dyslexic. I've helped create functions that facilitate this behavior, which is better suited as a mode that can be enabled manually. There are browser extensions that can do this sort of thing for you. I've worked on a lot of assistive reading features.

If this was set as a default behavior, most users would fucking riot. Most of them are using text highlighting for what this person doesn't want to do.

Edit - I think I need to emphasize that this is based on real data. A shit ton of it. These decisions aren't made based on vibes. If the user base is performing a specific action repeatedly, we're going to facilitate it. We can see what you all are doing. UI's aren't built around a bunch of conflicting edge cases based on anecdotes. If something performs a certain way, at least major applications, it's usually because a lot of direct observations and metrics have strongly indicated that this is the preferred approach.

Admittedly, sometimes business goals get in the way of that. But if those business goals we have to push get in the way of conversions, they get abandoned pretty quickly.