Wireless cameras offer an easier vector for people to get into your camera feeds. Biggest risk to this is a poorly secured network in the first place, but the risk is still there.

Also, wireless is going to be inherently a worse quality video stream, and constant video traffic being sent over your Wi-Fi bogs down your entire network.

All that being said Wi-Fi cameras are just fine and as long as you have strong Wi-Fi security you're really not at a real risk unless someone very savvy is specifically targeting you, in which case you've got bigger problems.

I have probably a dozen cheap wireless cameras in my house (to keep an eye on pets) and I have them spaced over two access points and honestly I don't notice a difference on my Wi-Fi at all, but I'm sure it's worse than if I didn't have them. All my exterior cameras are wired, but that's more because I want better quality streams and I'm running a wire anyways so might as well be PoE. Only exterior wireless camera I have is my doorbell but that's because I didn't want to run a new wire to it.

Overall wired cameras are much better quality, but they're not as convenient. Make the decision for yourself based off of your priorities. Real tough to get a wireless camera with the fidelity needed to capture license plates clearly, but if you don't need that then why worry about whether your gear can achieve it or not?

This is a guide for getting the rstp back for some of the wyse cameras. I haven’t used it myself https://houndhillhomestead.com/using-wyze-cam-v3s-with-frigate/. Someone else recommended thingno which I have read works but also haven’t tried.

One of the reasons wifi is discouraged is for anyone who lives in an apartments or even units, the wifi channels often very crowded. If you live in your own house it’s less of an issue but they still generate continual traffic. Having to punch through a few walls, as they will probably have to do if you are sitting them up outside, will have an effect too. As will the weather.

There are many tricks to running cable between floors. If you have down lights you can pop them out then use a bit of yellow tongue to poke between the holes, running the cable from light to light. most modern houses use pozi trusses for floor support and they have many openings for running services.

Or if you own the house just cut a few holes in the plaster. Patching and painting one ceiling not that big of a job and you’ll be able to use the same cameras for years and years instead of replacing when the battery dies.

Don't you need power?