I support this..there has been many times I see the enderman pick the block up and I go and kill it realizing i don't have that block in my inventory to fix the hole it created. Enderman can not pick up diamond blocks...there is a list at the wiki of what they can pick up Here.
Don't agree with anything you said except: fixing game bugs and adding the wildlife mobs (birds, squirrels etc.) just for esthetics..like the bat. i.e (They don't drop items or meat or anything of the sort.)
The youtuber Mumbojumbo has plenty of small simple redstone projects to build and also some more advanced ones. The tutorials are very well done, clear, and concise..maybe check it out. Site link.
I would also recomend learning about logic gates and the theory behid redstone. I good tutorial that explains different logic gates is here
Yeah im 34 and have been playing for a few years now. Still play on the same survival world i started in 1.4.5 and still have things I want to build and do. No plans on stopping as I still get enjoyment from the game (minus some of the normal frustration from bugs and such lol). Worth the money I paid fro the game man many times over.
Also to note....Mobs can not spawn on half slabs that are on the bottom half of a block. They can spawn on half slabs that have been placed to make a full block and on ones that are on the top half of a block.
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I would also recomend learning about logic gates and the theory behid redstone. I good tutorial that explains different logic gates is here
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