When it comes to creation myths from the deep past, I prefer there to be ambiguity. I feel it adds verisimilitude if scholars argue about things like "were the wind dukes angels or djinn?"
On the other hand, if the PCs actually encounter a wind duke for some reason, I would go with djinn.
Tanis is a pretty bad example, since there is nothing, other than his words, that indicate that he is not 100% human. Infravision? 30% Charm resistance? Never mentioned in the novels. Multiclassed ranger/cleric (the only unique feature and main reason for playing a half elf in 2nd edition)...
Doesn't make a difference, investors and banks still expect a return.
WotC and TSR are/were corporate entities, not people. They do not have "motives".
There is no implied criticism of your skill as a writer, or your ethics. Anyway, I'm British, so I have a genetic predisposition to sound...
I know nothing about motivations an goals. I do know a little about business. The reason a business needs to maximise profits is because if it doesn't the shareholders get antsy and the value of the shares, and hence the business, falls. This leaves it vulnerable to hostile takeover (by people...
You said "Please point out where I was discussing the game mechanics". Now, I read that as you saying you were not talking about mechanics. Either you think the game mechanics of Tanis (which are ignored by the modules) matter, or you think it's the things that are not mechanical - the sort of...
Falling back on memes is a sign of having run out of anything intelligent to say. You said mechanics didn't matter. Ergo you don't need to waste rules-space on mechanics for something that you can do just fine with the existing rules.
You weren't? Then we are on the same page - there is no need for rules for half elves, you can play one with existing species. Tanis would be human, Elrond would be an elf.
None of that has anything to do with his game mechanics.
Lifespan is also not part of game mechanics now. You want your character to be an 88 year old human? You can play that. It has no effect. It would be true for a human married to an elf in any case. Half elf is irrelevant here.
Then you...
How would you know he is a half elf (if he didn’t constantly whine about it)? Even his ears are covered by his hair.
It’s not even as if he follows the rules for half elves. In 1st and 2nd edition half elf fighters were level capped, and Tanis exceeds the cap.