Here's where I disagree with the idea that he was obviously holding back. If you look at some of the earlier season 2 episodes of
Justice League, when the creators were in serious "Look, Superman isn't a wuss, honest!" mode, he might've been punched or zapped or whatever, and stunned for a moment, but then he'd gauge how powerful the enemy attack was and become more stout, and the next time around the attack wouldn't be quite as powerful. So in the first episode, "Twilight," Brainiac zaps him with a laser-like attack, and Superman, struggling just
a little, would take the full impact but proceed moving forward. The same thing happens against Luthor in his battle armor in the following episode. Likewise, when Superman would take a punch in these earlier episodes, like against AMAZO who had Superman's strength along with powers from 4 other Justice Leaguers, he might go flying in the air, but watch that he doesn't clumsily crash into a wall. He gets his bearings and lands unharmed, ready to counterattack. Compare that to season 1, or STAS, and it was guaranteed Superman would grunt in pain and make a dent somewhere.
Another example I'd point out is the three-part episode "World's Finest." When Superman and Batman are fighting the battle robots, Batman looks like a total expert, dodging blasts and jumping over these large robots to avoid fire. Superman does neither (who's the one who's faster than a speeding bullet and can jump over the tallest buildings in a single bound again?), and repeatedly gets pounded by laser fire, all the while grunting in pain. If those laser blasts are hurting Superman, then Superman should at least finally decide "ENOUGH!", dodge the next attack, and pound the war machine. Either that, or he should concentrate harder on resisting the blast and stand his ground better the next time.
In short, they should've just written Superman's power level the way it was in season 2 of JL, and the movies that followed, in the first place. Instead, we get these weird scenarios such as when Superman couldn't slow down a War Wheel at all, whereas Green Lantern had the power to stop one its tracks until his ring had 0% charge remaining. Here are the gifs, since I already uploaded it months ago, also from season 1 of
Justice League:

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