I have a Clover Trail HP Envy X2. My brother has a Surface RT.
The issue with RT is that, there is often an application that a casual user needs. It is specifict applications, but not necessarily for IT computer expert.
In my case, I have a audio network streamer because I say bye-bye to CD player. This is a very commen Linn device (UK brank very famous in Europe as they are among the best streamer in Hifi).
There is not application for Windows RT. There are control app for iOS, Android, but not Windows RT.
So I have to install the x86 app control application that I could not on a Surface RT.
Also, I have a Synology NAS. Same thing here, many people have a NAS. There is not specific application for Windows RT. Actually, it works on a broswer but the specific application to browse/see the photo/videos or to browse/Stream audio on iOS are much more touch friendly that the one on the brower.
Also, I use 1Password that store all my password. There is a plug-in for IE, Firefox, Safari, Chrome but not for the Metro version of IE (obviously).
Just those 3 examples (and I am not speaking of running Photoshop on a 11" tablet) prove that being able to run x86 applications is very important for a lot of people.