I think of this as being straight up horrifying. This isn't exciting, this is going to be dystopian nightmare fuel. It's not hard to imagine this being imbedded into human beings against their will too, like prisoners in the US.
I would rather be a Borg, at least they were motivated by a collective good will to move to perfection, not puppets of a dying capitalist state and it's related ideology.
You can already do that. You could already do that over a hundred years ago. I think it isn't happening (except in the case of dogs and invisible fences) simply because it isn't very useful.
a boss can look at their company dashboard and see where productivity is dropping
Once the boss can do this, he would just threaten to fire the unproductive employee. That generally works better than what you're proposing because it doesn't require turning employees into cyborg slaves. (The hard part is actually measuring productivity when the employee is doing something that isn't easily quantified.)
Gotta start somewhere! For all we know the Borg began as a simple neural implant developed by Space Coca Cola, marketed as a way to touclessly interface with vending machines, but with the actual designed purpose to make you thirsty af and constantly crave sugary beverages.
And then the Coca Cola logistical AI gained sentience.
Another idea is that somebody found an exploit in the software and figured out how to use it for much more then interfacing with vending machines. So in essence the Borg is one giant botnet accept instead of ddosing or doing database leaching they assimilate people and make them part of the botnet.