What about jobs that aren't creative like coding or graphic design?
Some jobs are simply "sit in your chair and do work". The productivity metrics aren't speculative - they are measurable.
You may argue "these are jobs for AI" - but realistically alot of jobs are a way off from this.
Why shouldn't the "productivity" of these staff be measured? Because you don't like it?
If you work at "big shipping co" and "box" 1 item a day and your colleagues do 100, should you not be fired?