And the 'metrics' for productivity are completely gamed, in any direction, at any time arbitrarily.
Management/those that set these policies can 'turn up the heat' or relax them at any time, without warning. I've been on both sides of this.
Sure, you can hit some metric if some real product is produced, like widgets or something, but even in that hypothetical example, what if someone is top producer but skimps on quality or something resulting in a shorter lifespan of the product?
Before I left a recent employer a very (statistically and materially; i.e he was both very good at 'playing the game' and actually doing, you know, skilled work) high performer was PIPd (for "low performance").
In the previous half-decade+ he was there, he got 'exceeds' and top rankings every single year and was presumably paid more than the managers but was forced out, likely due to pay and internal politics.
I take most measures of 'productivity' to be totally fake, just based on my experience.