gtk3, gtk4 (probably?) qt, qt in flatpak, gtk3 in flatpak, gtk4 in flatpak (probably)... I'm just not fighting it anymore
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Some points are valid, but this looks more like the author (of the image) wanted to highlight as much as possible to confirm their own bias (that it's not well designed). Maybe I'm being ragebaited, but here we go:
Yeah, one shows breadcrumbs and the other a title.
First one is the "start menu" button. The tasks could also have text labels on them, of course they can have a different width to an unrelated element.
It can show two lines of text (as evidenced by the third item in the same row). It would look pretty bad if every item was centered on their own.
It looks good, but the red line the author connected from the snowflake to the horizontal line of the "H" doesn't necessarily back their claim that this is "absolutely pixel perfect alignment" because the horizontal line of the "H" might not be geometrically centered to the line height of the text and you could also have different characters in different languages.
Yeah, some elements like the scrollbars aren't positioned well (in this screenshot, this is a bit outdated tbh). But there's also the concept of a visual center as opposed to the geometric center.