Contexts are only partly about limitations. They're more broadly a process of categorisation, storing alike actions together. This makes it easier to organise your work in general.
Sometimes it's helpful to categorise because you can ignore contexts that you cannot do right now, that's true, but that's not the only benefit to it. Sometimes it allows you to do bulk processing of work, such as by rattling out several emails one after another. Or maybe you're logged in to your website, and while you have it open, you knock of the other three Next Actions that you have related to it. Or maybe you just feel like making some phone calls, nothing deeper than that, so that's what you do.
This is particularly true in the modern era, when many people will do 95% of their actions at the same computer. People still find contexts valuable, but it isn't about what they're limited to doing. It's about the increased ability to find the right task, for reasons beyond simple limitations.
So in your case, "Pleasant things" is simply a category of your Next Actions, by my definition. Many people have "Easy" or "Quick" or "Braindead" as a context, they're very common, and this is the same sort of concept. It makes it easier to find the right next action in a given moment.
Ultimately, if you want to consider your examples as priorities not contexts, then it doesn't really matter as long as your system works for you. However it might explain why you believe other people are not using priorities. They may be, by they consider them as contexts.