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No idea how it compares to Ring, but my wife is a severe technophobe and she had no issues or complaints with Protect. We only have one doorbell + one camera connected to a CloudKey+ though, so your mileage may vary.

Motion detection works reasonably well as far as I can tell, with person, vehicle and animal detection too.

Regarding the doorbell, one option you have is to try finding a second-hand Unifi G4 Doorbell (non-pro). It can be wired with only the two wires you already have. Just make sure you have relatively good 5GHz WiFi reception near your front door, because the 2.4GHz antennas on this model are notably bad.

Reolink might be another to consider.

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

3 acronyms in this thread; the most compressed thread commented on today has 9 acronyms.

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I've been running Protect since around Christmas on a UCG Fiber with a 2TB SSD, with a single G6 Turret recording 24/7 full 4k quality. As of right now, my recording history goes back to January 19th, or about 25 days. Based on that, rough napkin math would put 6 cameras at around 8 days of continuous FHD footage, by my estimate. Protect has per-camera settings that allow you to change retention policies, as well as choose between event-based recording, continuous, or adaptive, where it reduces recording quality for the uneventful majority of the time, then records full quality during events. These options would meaningfully increase recording storage time.

While I'm currently only running a single Unifi-branded camera, I have previously added four TPLink Tapo wifi cameras to Protect as well, though you have to enable an experimental setting to add third-party cameras.

Protect allows you to set up detections based on a wide range of events, I believe partially dependent on what camera model you use and what the camera can process internally. My G6 Turret can detect motion, people, vehicles, animals, license plates, faces, burglars, packages, glass breaking, sirens, car horns, dog barking, talking, etc. You can set motion zones to filter areas of the field of view for detections, you can set privacy blackout areas, and you can disable the microphone. Can't compare detections to Ring, as I've only used Google Nest and Unifi Protect. I haven't put a huge amount of effort into managing detections beyond setting a zone so I didn't get notification spam... of which you can set push notifications and/or email notifications per detection type. It's relatively easy and responsive to click through detection events in the app. Don't know how much slower it would be on HDD storage.

As for the doorbell, I've been looking to switch from Nest to Unifi, but I'm waiting for the G6 Pro Entry. Since you can't run Ethernet, have you considered the G4 wifi doorbell? It runs off of 24V AC that's typically already running to the doorbell. If not, I'm sure you could kludge something together in Home Assistant.

As for the interface and wife-friendliness, the setup side of things can get you a bit lost, but the day-to-day usage is pretty intuitive. It's easy to pick a camera and go into the detection history or scroll through the timeline.

UniFi NVR using non-UniFi cameras was a bit tough to set up, at least in a way that has ‘smart’ features. Presumably using UniFi cameras (and/or doorbell) would be much easier. But once running it’s easy to use, and there is a nice “Protect” app. Maybe check a how-to video for the app to take a look, unfortunately there is no demo site from Ubiquiti.

How long do you want to store footage for? With 6 cameras at 8Mbps each, you'd get less than two days of video on a 1TB drive. You could drop the bitrate quite a bit if you use H265 instead of H264, but it's still not a huge amount of storage.

Several manufacturers have sites to determine how much storage you'd need based on number of cameras, bit rate and how long you want to store the videos for. Just use any of those to get a rough estimate. Personally I'd recommend a 10TB or larger WD Purple Pro, since it has 512MB cache instead of 256MB.

For the doorbell, I'd use a proper doorbell cam that can use the existing wires for power. Reolink's wifi one comes with an adapter to use it with existing wiring.

The Unifi cameras don't support ONVIF, so you're essentially locked into their ecosystem, and it'd be difficult to use them with a different NVR if you ever want to switch. Maybe that's OK for your use case though.