Earlier quoted context omitted.
A good subtitle isn't a perfect copy of what was said.
Hard disagree. When I'm reading a transcript, I want word-for-word what the people said, not a creative edit. I want the speakers' voice, not the transcriptionist's. And when I'm watching subtitles in my own language (say because I want the volume low so I'm not disturbing others), I hate when the words I see don't match the words I hear. It's the quickest way I can imagine to get sucked out of the content and into a…
That's the thing though, subtitles aren't intended as full transcripts. They are intended to allow a wide variety of people to follow the content.
A lot of people read slower than they would hear speech. So subtitles often need to condense or rephrase speech to keep pace with the video. The goal is usually to convey meaning clearly within the time available on screen. Not to capture every single word.
If they tried to be fully verbatim, you'd either have subtitles disappearing before most viewers could finish reading them or large blocks of text covering the screen. Subtitlers also have to account for things like overlapping dialogue, filler words, and false starts, which can make exact transcriptions harder to read and more distracting in a visual medium.
I mean, yeah in your own native language I agree it sort of sucks if you can still hear the spoken words as well. But, to be frank, you are also the minority group here as far as subtitle target audiences go.
And to be honest, if they were fully verbatim, I'd wager you quickly would be annoyed as well. Simply because you will notice how much attention they then draw, making you less able to actually view the content.