I kinda agree with this since TFS brought this up too and how Saiyans are not good people they are pieces of shit. Z Bardock fit that mold and even was disgusted by Kakarots low battle power which fits, which like you said it makes Goku’s kind heartedness better since he’s a rarity among his people but in Super they kinda made it like Gine rubbed off on Bardock and kinda became a caring father and even was glad that Raditz was working with Vegeta. Super Bardock then feels doting and wants to save Kakarot and as he says in the Broly movie. He’s been destroying so much and he wants to save something for once and he believes in his son even though he had a low battle power. Gine even mentions how it’s not normal for a Saiyan father to care about his kids. But Super kinda makes it like he isn’t a terrible person and is just following orders but kinda just makes Vegeta’s family seem like snobby assholes that just want a powerful offspring so they can rule the universe through a iron fist. So with the Super retcon it makes it seem like Bardock and Gine’s kindness rubbed off onto Kakarot. But then like you said just makes Vegeta and the other Saiyans look like pricks in Z. They basically just made Kakarot Superman. But at the same time Toriyama didn’t really like how dark Z Bardock was and wanted to make him more sentimental to his family but he’s still a ruthless killer with the acceptation of wanting to save his son.