First thing: great idea to start this kind of discussions with the YBC community.
I personally think that one should not adopt a particular diet, at least not because of feeling pressure from all the posts/comments/content portraying "true yogis" in a certain way. However, I think that as you embark in your yoga journey, this will bring a lot of changes to your life and how you view the world.
As you become more connected, more grounded, you will start prioritising health, harmony and well being (for you and everyone/everything else around you) and this will probably lead to a diet change too.
In the beginning, when I started yoga, I immediately thought "ok, I probably should also become a vegetarian, start drinking juices , etc". I tried doing that but the sudden change and this feeling that I am doing it just to "fit in" made me a bit uncomfortable. Now, after over one year, of yoga, I can see true changes starting to happen. I learned what is best for my body, what I really like and to accept that my diet might not be everyone else's diet; and that's ok!
That's just my experience with it. I am in no way an expert, in either yoga or nutrition (I suppose just loving food doesn't count, right? )