Exactly right. The other thing is that sometimes they have to remove all of the original audio in order to do the vocal overdubbing. This means that incidental and ambient sounds like footsteps, squeaky doors, silverware clinking, rustling fabric, echoes and reverb in hallways, etc. get lost. They can “foley” some sounds back in post-facto by recreating them in the studio but they’re never as realistic as the original natural sounds.
I remember once being up late and an over the air station - I believe GRITv but I may be mistaken - was showing a Japanese movie called “Shaolin Ex-Monk” - dubbed over in English. The dub wasn’t too bad, but kind of amusing in that one of the characters was a Sheriff (or that is what they translated his office to be), and they had the voice actor have a southern / country American accent like a small town sheriff - and it was not a modern time period - so you had this clearly Japanese man with Japanese clothing and hair speaking with a voice of an American southerner.
One thing about dubs is that fight scenes usually revert back to the original voices...that probably sounds better than trying to dub people faking fighting voices / grunts / etc. but ads more awkwardness to having multiple voices for the same characters.
https://www.youtube.com/watch?v=EP8z5ivc83c
LOL - I found a clip of what I speaking of above - the “Sheriff” starts speaking at about 20 seconds into the video.