Why do they alays want Superman to be "weaker"

[superboy]

The idea of superman needing to be under the sun for eighteen years to get power wasn't actually john byrnes idea. In the man of steel #1, at the age of 9, he is invulnerable and was shown lifting a car! It was dan jurgens who made him so weak.

[BBally81]

From Justice League#2





It seems he becomes powerful enough to destroy Green Lantern's shield.

[Gernot]

It's always struck me as funny that The Whizzer is considered more or less the laughing stock of the MU because he got his super-speed from a transfusion of Mongoose blood

I thought it was his NAME that caused him to be the laughing-stock!