I think finding the right shoulder rest/chin rest combo can take some time. Also, I think this set-up can change, particularly for adults. I think young children starting out kind of shape themselves to their instruments.
I initially started with a Wolf Secondo & a Guarneri chin rest. I injured my left shoulder (fell off a ladder), & exacerbated it by how I was holding the violin. As a beginner, arm positioning can feel awkward. It is important to not tense up. And if what you’re doing is causing pain, stop.
After 3 months of physical therapy, I changed to a center chin rest (Flesch with hump), with a Comford shoulder cradle, and was comfortable with them for a couple of years.
Then after a while, these didn’t feel as comfortable (seems to coincide with when I was doing more shifting), and I tried a few different combinations again. I ended up with (& use now) a Bon Musica shoulder rest with a Wave I 1” chinrest. The Wave is like a compromise between a center & side mount chin rest. Don’t be afraid to improvise. A woman who played viola in the ensemble group I used to play with used a piece of cardboard wrapped with shelving paper in lieu of a shoulder rest—it worked well for her. I use a piece of cosmetic sponge on my Bon Musica so that it doesn’t dig into my chest. Working well (for now).
Characterize people by their actions and you will never be fooled by their words.