Another Cybersec worker here, and I'll broadly agree with all this. That said, I'd also point out that, depending on your site setup, the browser history may be nothing more than another place to correlate information we have from elsewhere.

Several sites I have been at have used Data Loss Prevention (DLP) software which automagically records (and possibly blocks) data moving into and out of the environment. This can be very detailed, to the point of knowing when someone copy/pastes data to a web form. I've also been at sites which sniff web traffic at the firewall and record full pcaps and extract metadata for quick analysis. So yes, for those not aware, deleting browser history or using "in private" browsing or other steps to avoid us seeing your porn browsing, may not be as effective as you think.

All that said, I've never been on a Cybersec team which has had enough time to really care about porn browsing, so long as you are not putting the network at risk. And, so long as HR/Management doesn't tell us to care. We have better things to spend our time on.

Lastly, if you don't want us seeing it, don't so it on a work computer. Look, we have lots of ways to see what you are doing. Just, do that stuff at home, on your own hardware. And leave the work computer for work. Writing up misuse reports is something I really hate doing.