Acts 2 did. The principle here is to use clear scripture to interpret the vague ones.
5 And there were dwelling at Jerusalem Jews, devout men, out of every nation under heaven.
6 Now when this was noised abroad, the multitude came together, and were confounded, because that every man heard them speak in his own language.
As for your second point, as I have said, this is a non-salvific issue so you could be right, I could be right, no big deal. (Romans 14:5)
If one believes that praying in tongues give him benefits than praying in ordinary language cannot provide, I am fine.
If nothing else, it has placebo benefits.