Which I've always found to be lazy, it's why Joker never intrigued me too much. You can't have someone preach a philosophy and then say "Oh, well he's not really a character so you don't have to question anything he says." that's epic laziness.
Again, it's not lazy. The villain's role is to challenge the hero, and the Joker does that best as the personification of chaos to challenge the Batman's goal of order. To give him a nihilistic/absurdist philosophy is only consistent. You may call it lazy, but it is how the character works best, and it has made him the most popular comic book villain, one of the most popular villains across all media, of all time.
Movies aren't going to be 100% the comics.
Stating the obvious doesn't make your argument any stronger. No, the movies aren't completely faithful to the comics, but unless the movies openly contradict them, the rules established in the comics are at the very least a good point of referrence.
He'd infused the energies of the Stone into himself rather than as a separate gem, and there was that thing about how the Convergence would give it more power to do anything.
Infusing himself with the energies of the Reality Stone could just as well be due to the fact that the Infinity Stones are very hard to even handle. Malekith would just have done so to gain better control over the Stone. It was also just the one Stone, the others weren't there to compliment its power. And Malekith was still able to recreate his limbs.
You don't know a boast when you hear it?
Just because it's a boast doesn't mean it's not true. As far as I'm aware, it has not been contradicted on-screen, or even by the makers of the film.
All I'm hearing from you sounds like your personal head canon. Aren't you the one who always complains when others try to explain Wonder Woman's power in battle against Ares with her role as the Godkiller?
So, please, if you have a point of referrence, whether it's an on-screen statement, or an off-screen explanation given by the Russos, Kevin Feige, or the two writers of the movie, please, share it.
Because, by your own standarts, anything less doesn't count, and my question stands: Why should it have occurred to me (or anybody) that Thanos could not use the Infinity Gauntlet to create more resources?