This is something they very much need to work on, and I hope we get either a better tool at higher tech levels or they just generally improve it as it's 1 of the things stopping me playing as much recently. Don't get me wrong I love the game still, but it's so annoying when you want to build a base and you first need to go around with a hoe flattening as much as you can, then you need to go around and use your pick to dig out some bits, then reflatten it, and just keep doing that other and over.

Seriously it takes so long, the only real sort of solution I've found so far is when building with wood to use the half wall piece for the bottom layer and put all of your floor on that level, with little posts under it to support it. It's a bit annoying as you lose a bit of height, but it saves you need to spend untold hours flattening it perfectly and allows you to just kind of level it out.

Luckily building with stone is a bit better as it's thicker so you don't need to worry as much about making it perfectly flat, it is still more annoying than it should be though, even the plain isn't that flat so involves a lot of mining the land flat, and the limited amount the hoe flatten lands and how much stamina it uses makes it take forever.