some of the formulation isn’t completely clear, but I’ll try to answer some things for you 
1. No, this has to do with inventory management (expand for Details)
Games don’t want you to constantly go in and out your inventory to select an item. It is simply to make an inventory system make sense.
If you have this restriction, you will do things step by step and consider what is important to take with you in your hotbar… and I think there is more positive sides to it. I think there might also be a bit of a downside/difficulty to making it automatic like that, but I can’t think of it right away.
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Yes, there are controls to Move Items.
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No, currently not. This would be an ‘Upgrade’ feature that you could suggest (see 6), but I don’t know if everyone supports an alike build style, it does not completely fit the style of Conan (not a ‘building’ game, being exile is rough xd).
Do note that replacing it with a completely different thing is not going to happen -
Depends why you are asking imo. Though,
Yes, Admins may use the Ghost admin command.
Yes and no, for building you are able to level building parts with the terrain using Auto Align to Terrain, but somehow putting them completely under the terrain means you have either encountered a bug or are using a prohibited exploit/cheat/hack to build under the mesh.
If you do find a way to exploit any game mechanic, please do not use it or ask/tell how to use it, but report it using the exploit form! -
If you check a Feeding Box in range it will display food information, but if you want to check your pet’s inventories you really need to go to the Animal Pen or Pet in question.
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Yes and no, if a stack is in an inventory slot, just Move Item (see 2), but otherwise no, I’m not sure why, but you could suggest it as a QoL improvement for building
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No, but there is likely a mod for seeing floating combat text.
Improving AI is one of the highest priotized upcoming features.
Getting stuck in bosses is still a problem, getting stuck in Rhinos and Camels is being fixed.
If you have any questions in the future, I recommend joining the fan-made discord.