When you remove a block with the hammer, it instantly disappears, but you still need to wait for the hammer animation to finish before you can remove the next block. I find it hard to get into a flow because of this.
For example in Minecraft in comparison, you very clearly see the block being removed. This even gives you a chance to cancel the removal by releasing the mouse button. I understand that the Eco way is very different here which is ok - but it makes the delay quite frustrating because it's hard to know when you can remove the next block and might be hovering over the wrong block at that moment.
Especially in singleplayer, it would be nice if you could just remove all delays associated with the hammer so you could build more easily.