The one good experience I've had with customer support for a hardware+software company was for the Eufy cameras by Anker.
Opening the app would stop the audio stream that was playing. No reason to do that while showing me a list of cameras. The audio stream should have been interrupted only once one selects a camera to view and listen to.
I wrote customer support and after some explanation and friction, they understood and a fix was released about two months later.
https://gizmodo.com/eufy-local-security-camera-cloud-unencry...
(I mean, I probably could make Amcrest stuff work if I tried hard enough, but I am at the age where spare time is precious, so I was looking for something that I could order and install without hassle or tinkering with mains electricity.)
UniFi Protect only runs on their NVRs and "Dream" routers and only works with UniFi cameras. The wireless cameras only work with Protect because otherwise there's no way to get them on the network. Once a camera is paired to Protect, you cannot get a standard RTSP stream directly from it (but you can restream RTSP from Protect). They've got a Doorbell camera that doesn't send ring notifications or video to HomeKit / Alexa / Google Home.
There's hack-y stuff to make Protect work with standard RTSP cameras. And a HomeBridge plug-in to get HomeKit. But it's all subject to breakage and YMMV.
All that said, Protect is pretty great. I'm a (mostly) happy home user.