That's punting the problem of explaining down the line. All the PV tells you is the computer is making this move because it thinks that 20 moves down the line, you'll end up in some desirable position.

It doesn't abstract or summarize any understanding. If you say, "well, what if they do Kf3 instead", all it can show is another PV. It can't tell you "knights on the rim are dim", or "this pawn needs to move now to prevent the bishop entering the position in 5 moves".

You can try to build an explanation on top of a chess engine, but it's very difficult to come up with generalizable or clear explanations beyond very broad heuristics (like "knights on the rim are dim").