It's also kind of irritating that this incarnation of Goku is now what we get in other mediums too, like Fighterz Story Mode.
But he wasn’t really all that flanderized in previous arcs.[/quote]
I can immediately recall a moment Goku really, really needed to pee, as well as one where he breaks through a wall when he learns Vegeta is training with Whis. Or him never realizing Monaka isn't strong, even being fooled by Beerus, who dresses up as him. Goku's most defining traits are constantly exaggerated in Super for comedic effect. Whether they work or not is up to the audience, but then there are moments where he's flat out uncharacteristic or off-putting, such as when he greets Black for the first time or the expressions he gives him after his speeches, which clash with the overall tone.
In DBZ, Goku was an idiot. Nobody can deny this. But it wasn't frequently played for comedic effect, nor did it clash with the darker moments in the story. He was dead serious when he committed stupid actions, be it giving Cell the senzu bean, not beating Majin Buu because he wanted the boys to do it, letting Vegeta live, and so on. There was a greater balance prior to Super, which made him more endearing. And honestly, if there was no flanderization here, then the general consensus wouldn't be that there is. It's pretty evident.