What is NOT logical and Cisco is doing all the time, is taking the RSUs back from employees that get laid off.
The logical point of the golden handcuffs is to keep you there, and if you aren't there that doesn't leave any incentive for a company to pay you. It doesn't matter whether management is objectively right, they've made a subjective analysis and decided you weren't worth keeping as they have at least annually and sometimes even quarterly for 23 years. You got your salary, your bonus and whatever stock vested plus a nice package if you've been there for a while. It's no secret that these have been the rules for decades.
A quick Google for "average tenure top ten tech companies" shows a list of companies where the left of the decimal point is the number 1. Cisco engineers can spend far more than that fixing bugs on a single project. Cisco is competing against far more aggressive companies where people are not collecting a full two years of vesting, and in the case of companies like Amazon the vesting schedule is highly biased towards years three and four where you will be PIPed before you can come close to that. To further encourage people to leave many of these companies don't make more stock available beyond the initial grants. Don't be surprised if other companies start seeing this as the modern path to "success."