I agree with your general principle but I do think infix notation is still better because so many equations are a tree of binary operators. Look at how binary trees are drawn - the nodes are in the middle of their children. It just makes sense for binary operators to have their operands on either side.
Otherwise you end up having to maintain some kind of mental stack which is just a bit mentally taxing.
Otherwise you end up having to maintain some kind of mental stack which is just a bit mentally taxing.