What about Windows "S Mode"? That's sort of the latest iteration on the Windows RT experiment, but you can turn it on/off on any Windows PC now.
I know the complaints remain that not enough apps are in the Microsoft Store, especially compared to iPadOS and Chrome OS if you include Android apps, but it is comparable to Chrome OS without Android support and still seems like an "alright, not terrible" third choice.
I know the complaints remain that not enough apps are in the Microsoft Store, especially compared to iPadOS and Chrome OS if you include Android apps, but it is comparable to Chrome OS without Android support and still seems like an "alright, not terrible" third choice.