I always found it interesting that Defender has always been touted as being well-behaved when installed next to other anti-virus. I have preferred to disable it

I always found it interesting that Defender has always been touted as being well-behaved when installed next to other anti-virus. I have preferred to disable it (IME, Defender's detection rate is poor, and the off-set in possible stability problems is not worth it) but haven't actually come across Defender misbehaving, other than false positives. This suggests it's probably using the operating system correctly, in exception to its peers.