It might feel rushed but I'm grateful that they kept it short. I mean, for those who read a lot of "swords and magic" type of fantasy stories, it is really annoying having the same explanations every time Here they showed it is the same principle, showing those the MC got, and that's all. I don't need anything more concerning how it works, as it is not the point here.
However, I agree that sometimes, in precise case of a weird or very specific type of magic, it is reaaalllyy intersting to see how the whole system is set. But that's mainly in stories where there's a lot of fights to come, so how they battle and what can be enhanced becomes very important. Here, I think the romance is still the main point and, I might be wrong but I'm not expecting a lot of fights, or at least not very detailed ones. She might have to defend herself occasionnally, but she's not the hero starting a crusade to defeat the Demon King either.
To cut it short, (even though it's already that long, oops.) for me this chapter is good as it is, does its job and it doesn't mean the others will be affected. I think it was meant to be this way from the beginning so wee can focus and expect more of the coronation ceremony and its load of little events that will inevitably appear.