At present even when you choose a “simple” RT what you get is typically still a little complicated. For instance: I’m making a blues song and I want a rhythm guitar. I can use the original blues guitar. It’s a good RT but the guitarist changes riffs throughout. Or I can use the Texas Blues guitarists, Brent and Sol. They have a simple mode but it still gets in the way.
So, how about when creating a real track they record the R/T but also a simple RY that plays the same thing in every bar. Of course, they would play chord changes.