Conditional actions (also known as "Advanced prototyping" in the plans & pricing) are available in the $15/mo Pro plan I'm using as of now. Can't say anything about the Student plans, perhaps they moved them. They were available to everyone while in Beta I believe. Haven't heard of plans to only make them available to more expensive subs. Won't be great for sure, but I don't think they'll do that as many freelancers like me are using the Pro plan. It would make it pointless to have a Pro plan without them, as they are the only reason to not be on a free plan. And for freelancers and small teams - a switch to different software like Penpot for example is much easier.
On the other point - yes. When bigger companies decide on a tool, it's a long term commitment. I of course don't approve of the way Adobe handled Xd as a whole, but it is what it is. It's "just business". Knowing how inefficient Xd is compared to Figma right now though, the broken text engine on Windows, the bugs - a lot of people are needlessly suffering 🙂