I ask because in figuring out how to configure a Christmas layout on the carpet in the room I want a dog-bone with two R1 return loops at the ends... because it fits nicely around my speakers/xmas tree and connects in front of my media console. But there is no switch for that configuration, so I had to get out the software and find a way to do it with the Straight/R2 turnout and some R2 bits, and other bits, and a lot of R1. and then deal with the tolerance error, and that the whole things geometry from the back(Top) down into the curve part of the switch is wider than I would like.



So why isn't there an R1->Straight turnout?

There was an R1 turnout in the Alpha system.

Why is there no R1 turnout in the C track system? I don't know.
You can make 30° turnouts and the angle will define the track spacing.
You can define the track spacing and calculate the angle of the turnout. Then you will need another piece to bring the turnout to 30°.

The Alpha turnout was 180 mm and 30°. Ideal for reversing loops, but will need short track pieces as fillers when used for large (shadow) stations.
There is no 180 mm straight track with C track - having 172 mm and 188 mm avoids the need for short filler pieces when sticking to the 24.3° turnout angle.

To get a reversing loop with a 24611/2, add a 24206 to the turnout and use one 24230 in the reversing loop and it will fit without bending.

I believe that Marklin used the R2 for the turnout to minimise the parallel track spacing. This is a problem with M track using R1 turnouts (but they also had the problem of being 30 degree curves which doesn't help the parallel track spacing).