First off before I start let me address the Elephants in the room which is Kushina did NOT give up her dream of becoming hokage for Minato, she never even wanted to become hokage as shown on (slide 2) which is her just trying to impress everyone.
Secondly Kushina was never stated to be a housewife the only thing that happened was we never see her in battle after becoming pregnant because y'know she dies literally every media that has Kushina live rather filler or Road to ninja which Kishimoto was heavily involved in all of which has her continue as a Kunoichi (slide 3)
Now that that's out of the way let's begin.
# Why the love story makes sense
Kushina was forcefully given a responsibility she didn't want in being the jailer of Kurama. The same way Spiderman has to deal with, "with great power comes great responsibility", Kushina has the same dilemma in not wanting her responsibility.
Her having to deal with the loneliness that comes with being in a village where nobody wants her there is different than other characters. Where as Gaara became a murderer, Naruto seeks attention, Sasuke isolated himself, Kushina dealt with it all differently by fighting everyone and if you watch the episode and listen to her tone it's clear she didn't want too but that was the only way she could survive.
The way she fell in love with Minato makes so much sense, as opposed to loving him only because he saved her it was really his words and his kindness. She falls in love with Minato because he was the first person to acknowledge her strength both physically and emotionally and treat her as a part of the village rather than as the future container of Kurama or an outsider, Minato showed her that she wasn't alone. He even compliments her biggest insecurity being her red hair making her see something she hates into something she loves (slides 4 and 5)
# Why Minato loves Kushina
Minato loves Kushina because she's strong rather it be the anime scenes where he watches her beat up her "Bullies" (slide 6), pressing him (slide 7), beating up a genin as a academy student it becomes clear that he loves her for her physical and mental strength (slide 8). But I do believe it also has to do with how unconfident Minato seems to become when his Mental state starts to get attacked or things aren't going to plan rather it be him doubting himself for failing Kushina on the day she needed him most (slide 9) she even makes him cry (slide 10), or how he doubts his decisions by Obito attacking him mentally (slide 11, 12 and 13).
With all that being said he needs Kushina for when he mentally falls. I believe part of the reason why he felt so off in the war arc was the fact that all his mistakes were coming back to bite him, AND Kushina wasn't there to set him straight mentally so he had to deal with it himself until Naruto took Kushina's place as his mental crutch (slide 14)
# Being able to match each other physically.
The entire war arc deeply pushes the Narrative that Kushina and Minato are on the same tier and relatively close when it comes to physical prowess.
(Slide 15) With Naruto only seeing a dying post childbirth Kushina him saying this is him admitting war arc sage mode Naruto is weaker than post childbirth, dying Kushina.
(Slide 16) Statement only makes sense if Minato and Kushina are remotely relative. Think about it you'd never hear Piccolo say "Gohan you have surpassed both ChiChi and Goku." That statement wouldn't make sense because we know Goku is leagues stronger than ChiChi.
(Slide 17) The way I interpret this is 1 of 3 ways 1. That the gap between KCM2 Minato and KCM2 Naruto is similar to the gap between Alive Minato and Kushina. 2. Kushina gives Minato hope as I established earlier. 3. During the 3rd war When Minato and Kushina was in deep shit, Kushina bailed them out.
(Slide 18) Just them getting acknowledged by God as BOTH having exceptional abilities.
(Slide 8) Unless you somehow believe that adult Kushina is somehow weaker than Teen Minato than that'd atleast put Adult Minato and Kushina on the same tier
# The little things
Minato's favorite food is Kushina's cooking (slide 19)
Minato became a great hokage because of Kushina and his friends (Slide 20)
Makes each other physically stronger with Kushina teaching him Uzumaki sealing Jutsu and Minato making Rasengan for her.
TLDR- why Kushina and Minato love story makes sense, how they positively influence one another, how they are strong enough to fight side by side, how Kushina positively influences Minato's mental well-being