Nah. I'm running R2019b on Linux. The offline help browser just hangs with a blank window, occasionally requiring killing MATLAB. If I recall, that's a known bug or tangential to a known bug.
You have a point though. I have the help files locally, and I could open up a file browser and dig through them and open them in an external web browser.
... but the only docs I have locally are for R2019b or older. That might be fine for my own needs, but it's not going to help me (slowly) answer forum questions.