I think you are missing the point. When we were on the 400 the 800 arrived and we were rostered IPT and sims to fly it. We became dual qualified. It was not a promotion.
The 350, according to our Lords and Masters, is just a modern 330. In the same way, we get rostered to fly it. It is not a choice. This is not a promotion but a slow migration to the 350 as the 330 is on its way out.
Do you really think we can sit around and not fly the 350? Don’t be an idiot!