TCL do one pretty cheep that does all that although I had issues with mine and replaced it with a more expensive Sony Bravia. That does everything you need but will need help setting up the screen reader. After that it's really simple to use and you can even attach a USB keyboard.

Is the voice quality really that important for a TV? I mean, you go to the streaming service you like, choose a film or show and then the voice can shut up or are you using your TV for other things I am not thinking of?

I'm looking at samsung tv's RN because I have a soundbar from them.I am not sure how usable their OS is though and how well streaming apps work with the screen reader.

We have a Samsung TV and it works great. On ours, pressing and holding the Mute button will activate the accessibility menu. It may be different on other remotes, but if you wait for a little bit after turning the TV on for the first time it will tell you how to enter accessibility settings.
The accessibility shortcut screen always talks regardless of whether or not voice guide is on so that's a plus.
Both Fire TV and Roku have decent screen readers from the little bit I've looked at them. VoiceView does have a lot more delay compared to Roku's reader, so that's probably the only advantage of using such a low quality voice.
Like Chris, I think they could've done better than RHVoice, but at least it's something.
Also if being able to use the device in a language other than English is important to you, don't get Roku. The reader tells you that it's only in English if enabled during setup.
LG's screen reader isn't bad, but there's no way to enable it at setup so the TV is pretty much useless unless you can find a way to OCR the screen.
I've heard mixed reviews on Android TVs, so make sure to do your research before buying one.

@10, VO is  very performant, the device's hardware is bery overpowered for it, apps open instantly. That's my experience. Some third party apps might have accessibility issues, and the keyboard is annoying to use because it's one long row of letters. Also airplaying to it has pretty low audio latency which is great.

I am going to give my recommendation to my samsung TV. I got the thing out of the box. My parents mounded it on the wall. The TV came up talking and told you exactly what to do. I had no idea how to use one of these and I learned in a few seconds. Samsung will give you the lease amount of trouble when setting up for the first time.

Samsung and Fire TV do the same thing.
I agree. Roku is a good option, but like I mentioned in an earlier post there are things to consider before getting a Roku product.

really? I have a hisence one and it works like
a charm

I think that it would b good to write down the models of TVs we have. Some of them are newer and have mpore processing power and work well with the screen reader. I will find the model of mine and write it on here.

I have a Roku as well as a Fire TV. Both are extremely accessible.