This is the first post lol
It's to do with how well they're done - first of all, comics and movies are different mediums, so there's no use comparing the two so candidly. You're also forgetting that that issue of Thor (and many of the "sjw" themed ones thereafter) was made in response to the sexism found online when Jane Foster's Thor was announced. No one takes sexists/macho men on the internet seriously either - just like a strawman. I don't see what the problem with that is? I mean even ya boi Snyder did the same with Jimmy Olsen - made an infinitely more pivotal character a red shirt. At the end of the day, in comics you're gonna always find lesser known villains being used in a way that counteracts their previous appearances (The Orb, Kite Man etc etc), it's not that any given publisher or creator forgot that, it's just what those characters evolved into years ago.
The problem is it wouldn't be interesting because that would be similar to the Superman we had since MoS - he'd been grappling with who he was and didn't know whether he was humanity's hero or not, so him deciding that would just be a decision to his original conundrum. Thor, however was often told he would be king, he was Asgard's hero, it's in his blood etc, so for him to complete that journey and then instantly have Asgard decimated, half his people die, and a further half of the universe die because of his choices and (in his mind) failures, he's realised that perhaps the road that was set out for him, is not the road he has to take - that is infinitely more interesting and tense than his first 2 movies which just had him sure of what he has to do, and hitting the bad guy til they fall. In regards to his hammer - he couldn't go get it because he was trapped on Sakaar with Hulk, and they needed to save Asgard immediately. I absolutely agree he shouldn't have gotten a new eye, but I've learned to live with it. It's easier to cut off a head with an axe than to cut it off with lightning yknow. If his lightning wasn't enough to defeat Hela, it definitely isn't enough to defeat the strongest threat yet seen in the MCU - an axe forged via the heart of a dying star would definitely help. And IW and Endgame were pretty much JUST fan service, because they had built the franchise into the most popular franchise in the world over a decade, everyone was a fan by that point - this is what's different between that and let's say BvS. To you, me, and other comic fans, it's a pretty cool thing to see Batman in that power armour holding a kryptonite spear, but to the general audience they don't care because they haven't been given ample time to get to know both these characters. I'll reply more in depth to your Ragnarok claims in a sec.
Movies don't just have one tone, there are multiple tones - generally Marvel has the humorous side, and the more character building, heartfelt side - another example is Civil War, which, like Endgame merges the two very well. They chose Thor to react that way for a very real reason though - seeing what is supposed to be a GOD eating and drinking himself to death, becoming an absolute shadow of himself, hits it home more and offers up more dynamic within the movie. And it's not treated as a joke by the film - by certain characters yes (Tony, Rocket, and Rhodey because that's how their characters would act) but the film treats him as a grief stricken God who is so hurt by grief and guilt that he damages himself in the process. In the end it doesn't matter, he is still the same great warrior that is worthy enough to lift Mjolnir and is even pleased when one of his best friends can also lift it. His guilt, his grief, his weight, his failures haven't made him unworthy, he is still a hero at the centre of it all and that's what matters. That's what's absolutely beautiful about his arc imo.
I know that, as someone who has put on weight due to grief and guilt, Thor's reaction is very realistic - especially for someone who's been built up to be a King and a leader. The idea was to make him relatable and they succeeded. I would argue that it wasn't played for laughs either, the initial laughs come from the SURPRISE of seeing this Godly, Herculean man that we've known for nearly a decade, look so different - it would be the same reaction if he was wearing the same clothes and no big ol' belly. I'll also say that as a fatass myself, I didn't find it even the mildest bit offensive.