But it seems you've cited an example of something ironically very anti-labor. This means your government has codified into law the false idea that all human employees are undifferentiated commodities (like cattle). So as an employer, if there's no ability to remove underperformers every year, you've turned employment into a market for lemons, and created a classic adverse selection problem: https://en.wikipedia.org/wiki/The_Market_for_Lemons
A market for lemons 1) suppresses prices [wages in this context] 2) decreases price variance and 3) creates inefficiencies. As 50% of workers are actually above average (statistics!), you've created a negative feedback loop hurting workers wages and ultimately growth in the economy.