absurd amount of anomaly detections per day, usually with a 99.9% false positive rate
Adding lots of red tape and restrictions and wasting time investigating employees who've done nothing wrong
What I've seen/heard about is that you end up with some EVP pissed off that IT/SEC is bothering their people – rightly or wrongly, it'll inevitably get used an excuse for why something is late. So the EVP (virtually) marches into the office of the IT/SEC director and issues an edict that everyone in <this super special department> are too important to be bothered and any access restrictions or investigations affecting <the department> must get prior approval from the EVP's office. That's of course a huge pain in the ass, which results in that department effectively being exempt, i.e., a perfect place for an internal spy.
The IT/SEC director, often several rungs down from the angry EVP, usually has the authority to stand up to the EVP, technically, but that is a risky move, can easily start a turf war.
So, for these programs to be effective, they must get buy-in from the absolute highest levels with no exemptions, which is not easy in the highly political world of huge organizations.