Gameplay change by Block behavior change

As already mentioned at several other occasions, here is again the standard early-game-skip: Run to closest tree, get 4 blocks of wood, make a wood pick, dig 3 stones, make a stone pick, dig deeper, find iron, make an iron pick, find more iron -> full iron armor in about 5 minutes.

This really has bothered me for quite some time now. You are adding loads of content at the endgame and completely forget that you can spice up the early game with stuff you already have, if you apply changes as follows:

- It is not possible to hit a tree stump with the fist any longer, you will only injure yourself. Instead, you have to harvest leaves until sticks drop, and hit the tree stump with sticks. Then you get your wood pickaxe.

- Stone can only appear at height 40 or below. everything above up to surface at height 70 is either andesite or diorite, both can NOT be broken with the wood pickaxe. This means, you will HAVE TO find an existing cave and venture inside. You will not want to do this naked, so you will have to get leather armor parts first from cows, to be able to survive in the cave. There should not be iron armor parts or iron any longer to be found in cities, or, only with a very low chance. Instead, there would be wool or leather armor in these chests. 

- Once you managed to reach height 40, you would finally hold stones in your hand and be able to obtain stone tools/weapons. This is how cavemen had to do it!

- Now you can go on as usual. You probably took half an hour or longer to pull this of (considering you had to care for food/shelter as well), which definetely spiced up your early game quite a bit!

- Once you have an iron pick, you finally can pierce the bottom 20 height levels, where there is a lot of granite, which wears your pickaxe faster, but only here you can find the diamonds.

I managed to simulate this with version 1.12.2 (create a customized biome, page 2 of customization allows this), and it was much more fun than the current early game, which forces me underground without having walked as much as 10 blocks on the surface before hunting diamonds.