I was wondering why Chess isn't played with flat pieces, like Shogi is, or like how Chess itself is represented online (where people mostly play with flat 2d pieces even though most sites also have a 3d theme).
Personally, flat pieces seem more clear to me, albeit less pretty. When the pieces are tall, they start blocking each other and it's not immediately obvious where each piece is.
For example, here's a simple example. This board isn't even close to being cluttered, and yet I still need to glance at white's pawns to make sure they actually are there, because they are close to being blocked by the other pieces. In particular, the f2 pawn is a bit hard to see. Likewise, Black's c7 pawn is blocked by the knight.
And I know that this can be fixed by getting closer to the board and looking at it from a top-down perspective, but ... first of all, that's annoying: sometimes I just want to lean back in my chair and stare at the board from a distance in a relaxed position: yet I can't, because now all the pawns are blocked by taller pieces. And secondly, if you are going to be looking at it from a top-down perspective ... why even bother with tall 3d pieces? You're perspective will make them look like 2d anyways.