Your right about Goku giving Cell a senzu bean. Goku realized his mistake when Piccolo said Gohan feelings towards battle, which is why Goku was going to eat a senzu bean and help Gohan. When the Cell Jrs were beating everyone up, his admited his mistake.ABED wrote: ↑Fri Jan 08, 2021 6:25 pm Need I say again that Goku threw Cell a senzu before he fought Gohan? But sure he's always serious
He regressed because one time he wasn't aware that a psychic was messing with him?
And if he wins the TOP there is no need to resurrect his friends. Winning means they survive
You finding his enthusiasm to train annoying is not a regression.
When Goku realized his mistake, that is when he was serious.
Goku was aware that someone was messing with his body in the tournament as a kid, while Tien was unaware of Chiaotzu magic messing with Goku. In DBS Goku wasn't aware that the same person was messing with his body.
Whis agreed to train Goku once he finished eating, what Goku should have done is wait and not be a pest to Whis. Goku was never a pest to any of his masters. He wasn't a pest to Master Roshi, Korin, Mr Popo, Kami and King Kai. We can't say anything about Yardrat since that was off-screen, although in the manga they didn't say anything bad about Goku.
Edit I forgot to mention Goku made friends from Universe 6, surely Goku could have told Jiren that he would wish all the erased universe back.
Goku in the Cell Game when he was listening to the radio, he heard strangers dies which got Goku pissed of so much that he went to Kami Lookout to check if Piccolo can split to make the Dragon Balls to revive everyone, when that wasn't possible Goku even went to Namek for a new guardian.
In DBS Goku saw the other universe get erased and he didn't think to wish for them to return.