For example, anime Goku is stronger than manga Goku, yet cartoon Superman is weaker than comic Superman. Why is this the case? Why we don't see cartoon Superman destroying a universe or travel massively faster than light+ like his comic counterpart? Can someone please tell me???

DC Comics

DC Animated Universe:

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I’m guessing they nerfed their characters in an effort to tell a better story and make them more grounded. This also makes the threat/villain seem larger. I know that in season 1 of JL they purposely nerfed Superman to the bone so he wouldn’t just come swoop in and save the day. It wasn’t until JLU that they took the kiddie gloves off and had Superman destroying cities in fights and have city shaking punches.

Ask Justice league movie

Well, Western comics did not decide to follow the path of Japanese Manga animations, actually the anime, where any canon feat is actually introduced into the animation, even when it comes to the storyline and it's like that because what Marvel or DC wants you to do, is just to buy the comics so that you can enjoy the canon.

Another thing, is that the power scalings is just too huge as the storyline proceeds, at some point, it doesn't make sense to animate those feats of power or speed and other special capabilities, because for the same reason for trying to animate them, is just contradictory those lowering its real impact, for sure there could be ways, but this does not apply to all characters which have multidimensional powers, ethereal or abstract capabilities, the Speedforce, I think that common sense and imagination does a better job.

PS:

Animation can't keep up with the requirements, maybe at the beginning, but then, it's game over, Superman becomes too fast, WW, Silver Surfer, Thor, Flash, Darkseid, Thanos, etc... it's just too much in the late phases of the storylines, they gain advanced perceptual powers, matter manipulation, time manipulation... endless of powers which are way too complicated to illustrate or express through animation, Dr.Manhatan's powers, the Chaos Energy, etc...

It’s about the story really. The more powerful people are the more complicated things can get and they want to keep the show understandable to a general audiences same thing for movies. Additionally, for everyone to remain important they need to bring new to the table relative to both their allies and in respect to the opposition. Take MMH for example, if he demonstrated the level of variety and power he did in the comics the roles of others would be redundant. This is part of my biggest gripe with Justice League the movie because Supermans power made everyone else irrelevant

Because 9/10 times when you see a panel that is considered a strength or speed feat it's their so that a reader can go "woah, that's cool" and its explained as such.

When you have animation, especially in the DCAU's style of American animation, you have 21 minutes to tell a story that hits all the beats you need it to.

In a comic, manga or a action anime. It's all about the fights and feats. You will be told a thousand times how impossible it is to do something, so that you are amazed by what happens when they do it.

A quarter page of narration to tell you that this secret base is made out of the heaviest strongest metal in all the galaxy. An exact number down to the picoseconds on how fast a energy blast is fired,

Why?

So that we know how strong superman is when he throws the base into the sun.

So that we know how fast flash is when he out runs the energy blast.

In American animation. It's not important how heavy the base is. It's important that Superman was beaten, tortured and exhausted but when the Earth was in danger, he overcame it all and through the bad guys base into the sun.

It's not important how fast Flash is. It's important that after out running the laser and saving a city worth of people. No one takes a picture of his face and he earns the respect of his biggest hater.

No one cares that a robot over powered Superman for a moment and through him away from the battle so now he scales up to being a High Herald Über Tier. The story is about a dying little girl.

In comics they have the luxury of doing a little of both. In animation they need to trim the fat and focus on what you want to convey about your material. Is it that Goku is getting strong? Fine, hes over 9000 and just beat a universe buster. Is it that Superman never gives up? Then we break him down as horribly as we can only to have him rise back up again.

Bump.