How could Goten have been written better?

[Zebra]

The implication is clearly that he trains very little, if at all. He no longer has any real passion for fighting.

[Koitsukai]

The EoZ bears no other interpretation than Goten wanting nothing to do with training anymore. “My dad is forcing me to do this, it's his idea” is supplementary to the fact that Goten is seen gasping for air like he just gave birth. He spends half the scene on the ground because of how out of shape he is.

It’s a kids' show and its wrapping up, there are no ulterior subtexts, it's a simple scene not intented to be overanalyzed like it's some deep situation for the character. It’s straightforward: a guy is forced to train, a guy is out of breath after training, and the guy is said to be slacking off. So what does that point to: the guy actually loving to fight, or the guy simply not caring about it anymore?

GT picks up after this and has him completely out of that life. Wonder why...

[Zephyr]

Also, when Trunks shows up he says "Goten, I hear you've been training." That makes it sound like Goten training isn't the norm.

[super michael]

It is looking like Goten did stop training in EOZ, he doesn't have interest in training.