congratulats to the people liking them i guess. i personally dont get it, since most languages are written horizontally and i like ux to reflect this structure. such things are subjective though
The counterpoint is since 16:9 became the de facto standard for monitors, vertical resolution is at much more of a premium than horizontal resolution is.
Not to mention that most sites will put their main content into a container with a limited width anyway, since overly long lines are awful to read. So unless you're using the browser side-by-side with other content on a low-res monitor it's a net benefit. And even if it's not I usually find the extra vertical space to be worth more, as you said.
i get where youre coming from, but imho the eye tends to parse information more effectively if delivered vertically, since it knows it that way from other media. just my personal opinion though.
Then why I struggle a lot to navigate through Discord compared with any other messaging app, such as Telegram, don't answer, probably because Discord UI is trash.
I think you're missing what's going on. The text is still written left-to-right. You don't need to read the tabs vertically. The tabs are stacked on top of each other in the sidebar instead of lined up along the top of the window.