It is nice to have the message that the changes are saved. However, having to click Ok is a bit tedious. It gives me the impression of being treated like a kindergarten child: "The changes are now saved! You can now click on the Ok button to continue. Blah, blah...". I am not a kindergarten child, I am a teacher!
The message could simply be on the main page. For example, in Youtube Studio, the confirmation that changes are saved is as follows. The [Save changes] button turns blue as soon as a change is detected and returns to gray when saving is complete. The message "Changes saved" also appears and disappears automatically after 5 seconds. Same information, but no click required!
I'm not saying that it must be done in exactly the same way, but it would be nice to get rid of having to click Ok.