BTW, what is your take on Intego AV ...
Apple is the most famously secretive company in the world. Apple's operating systems run only on Apple's hardware and they license neither to anyone. Why anyone or any thing would claim macOS knowledge superior to Apple's own is one of the most curious aspects of 21st century technology.
I personally evaluated all the popular Mac "anti-virus" products a while ago. Their effects on a Mac ranged from benign but useless to practically malicious. Intego's "Net Barrier" and "Virus Barrier" products resulted in the worst performance degradation of any product I ever used. The Mac became practically unusable as Intego churned and chugged along, looking for viruses that don't exist. No knowledgeable Mac user would have considered it even remotely acceptable.
I think you're missing the point though. This is not about any particular product. All non-Apple "anti-virus" products are categorically worthless. Installing them will expose a Mac to more threats than would exist without them, and the Kaspersky example I cited just happens to be the most prominent.
It shouldn't have come as a surprise to anyone:
Security wares like Kaspersky AV can make you more vulnerable to attacks | Ars Technica
Similar products will have similar vulnerabilities just waiting to be exploited:
It might be time to stop using antivirus | Ars Technica
Security and user space isolation have been a fundamental aspects of macOS since its inception. Each succeeding version has only grown more secure. Outside of proof-of-concept models under controlled conditions a macOS virus has never been successfully implemented, and with the introduction of SIP a while ago it can be said there will never be one. There is only worthless, time- and money-wasting garbage a user can willingly choose to install. Non-Apple "anti-virus" products might as well be in that category.
As computing and communications products go, Apple's are the most secure consumer-grade products on the planet, by far. If Apple's customers are bound and determined to install junk on their Macs though, macOS does little to intervene. If they couldn't, a Mac wouldn't be the general purpose computing appliance that it is. The alternative is iOS, running on devices completely closed to user-inflicted modifications—which is probably where macOS is headed anyway, eventually.
Apple's target demographic has frankly become too stupid not to require such nanny-like impositions, but guess what happens then? You got it, people complain: FTP server, Mac OS High Sierra.
... and firewall?
The purpose of an application firewall is frequently misunderstood. Not surprising, since it is also woefully misnamed. There is no fire and there is no wall. It sounds good though. Like "cleaning".