minecraft will never lose it's blockiness that's how the game is ment to be its easier to build with and its simple which many people like, trust me if they mojang wanted to they could make it MUCH better but they like it like this and most people do too.
No, all your saves will stay.
You will lose all the items in your inventory and your experience and respawn.
in later versions, if you fly too high and lose your world in Minecraft PE, you can kill yourself by digging to the end of the world. but in 15.1 you can't kill yourself
they probably have bad computers
it makes your armor stronger so you lose less lifes
No, but dogs (wolves) do lose health and will eventually need to be fed.
Nothing will happen if you keep installing and uninstalling Minecraft. Minecraft does not track how many times you have installed it nor does track how many computers you have it installed on. The only drawback is if you uninstall Minecraft by deleting the .minecraft folder you will lose all of your saved worlds on that computer.
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Check the forums for your other mods to see what mods they are compatible with.
If you are asking for a username and password of another person's account, here is not the place to do so. Not only can their account be subject to a password change, but they may lose their account. I recommend buying Minecraft, if you find it a good game!
Depending on what you mean by "lose" your world it could be corrupted or not installed properly and you might have just acedently deleted it but if you did any of those thing I am sorry to tell you but think you will not be able to get it back.
MINECRAFT!!!!