I think you people are overthinking this. Their culture is as alien to us as our would be to them. At the end what counts is if they are all happy with the arrangement.
While I have an issue with how the author presents his story - it's chaotic, that's why people find the pacing odd - there is no denying the fact that a well timed one-liner can make me forgive a lot.
"Everything you have is only borrowed" *punches the guy into the wall* - masterful, just like...
Holy crap, the guy making this manga has no idea how pacing works. Why is he focusing on inconsequential events when more important crap needs to be covered? Is he trying to replicate the WN/LN word for word?
I have to give props to the author for showing the realpolitik in full force here. Most everybody hate this alliance and the fact they basically were faced with a fait accompli, but because of the external force they have no other choice but to fight together shoulder to shoulder. You can just...
I'm really getting tired with authors not even feeling the need to justify why someone would end up getting isekai-ed to a game world. Is it so hard to even come up with a BS reason?
Woman, you could have had all the technology your heart desired and more. Then only thing you needed to do was ask your future husband to bring some books.