This may sound crazy, but I honestly think Obito didn't need this flashback. I think Kishi trying to dwindle his past down to his "breaking point" is a bad idea, as most times it's usually portrayed as a sole petty reason as opposed to "the straw that broke the camel's back".
We already know Obito is a failure, and that he wanted to drink Rin's bathwater. He never could win, so isn't his motivation for wanting a world where "Everyone wins" enough already?
Nagato's idea of uniting the world through a common threat was also decent the way it was.
A trip down trauma lane usually bastardizes a villain's motivation, because we're viewing their breaking point from an objective standpoint, we wait for "this is when this happens, he goes evil here", and their motivation is simplified to that exact moment.
That's why we get posts like "Nagato blew up Konoha because of a dog named Tiny, boohoo.", or "Obito is doing this just because Rin died". I know some posters are joking, but some aren't, and who could blame them, when the manga makes that the focus behind their motivations instead of the actual mental build up and break down.
Nagato killing Jiraiya should've been a MAJOR, CATASTROPHIC deal for him. It was literally a clash of ideals, and he had to kill his own teacher to move forward with his goal, but that aspect is brushed over pretty quickly in his and Naruto's discussion. His motivation and determination feel paper thin because of that.
Killing Jiraiya didn't "feel" hard to him like it should have, and him turning over to Naruto's simple logic pissed on the sacrifices Nagato made for his ideals.
It seems the further a villain's motivation is dug into, the more it backfires on the author who can't write psychological depth.
I feel Kishi is heading down the exact same road again with Obito, and quite frankly, I don't want to see it.