When installing a new extension all users get the error:
 
"The administrator has made a change to the system that requires you to restart your activity.

“Page X has to close."
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Also web service sessions got this error.

When we are in the middle of a go-live, we need to bugfix a lot of issues.
All users will get this error at random times (in their eyes), and will not trust the system anymore. ‘It’s not stable’ you will hear.

We want to change code without interrupting the users (like we did in C/AL in codeunits for example)
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It would be nice to give only an error for the object that was changed.

The update process may take longer but without errors.

Maybe make an option for this on service tier level.