LP, paras, thoras are different level than y90. I don't think many Dr docs are saying they feel comfortable with the high end stuff. If they were saying they were as good at y90 or tips as an IR, I would say they are in fact dissing IR.
As I said a dr reading out of fellowship still has a year more Dr training than an IR doc does. At some point the difference is training is significant. Then you might say the IR guys are still passing CORE, but the problem there is everyone says the CORE doesn't reflect real practice so being able to pass it doesn't mean much to me in terms of being sufficiently trained to read DR.
I'm not taking an absolute stance, I know a lot of IR docs that are extremely impressive with their DR knowledge. I'm saying as you modify pathways more and more, and add IR training earlier and earlier, that has to end up having an effect on DR knowledge at some point.