I think Arthur's answer provides a good framing for this - nobody "should" have to do any house work, it's just a "necessary" evil in today's time, so there's no objectively right or wrong answer.

That being said, I think it may or may not be the most fair way of doing it depending on whether the house work is roughly the same amount of work as the job or not. I guess chances are it isn't, but it may be more or less. If it's more, then the person with the job "should" do some of the house work. But there are other extenuating factors, like what if the stay-at-home person is disabled? Or what if menial labor makes them more miserable than it does the person with the job? Or what if the house work is somehow harder than the job? Etc.

But anyway, again, what's best is ultimately just whatever the couple agrees to...

I only upgrade when I have a specific reason to, like it breaks, or it no longer supports some app I want to run. I was using a Galaxy S6 for a few years up until 2022, when the battery started going bad and also one of the games I'd play on it was no longer supported by the OS, so I got an S22 Ultra, and I've been using that since. My current desktop PC I got in 2018 or 2019, before that I'm pretty sure I was using a gaming laptop that I had gotten in 2010. My laptop I use now is probably not much younger than my desktop PC. Though it may be about time for a new laptop...my Wi-Fi and Bluetooth recently stopped working, and the laptop's been randomly rebooting for years. Though I ordered a new Wi-Fi & Bluetooth module today to see if that solves the problem, we'll see how that goes, I don't get it until Jan. 8th at the earliest.

That's basically the intention, to offend them. It's a gesture of insult/disrespect. It's the hand sign for "f*ck you," so they get mad for the same reason they do when you say that.

To go a little deeper, I suspect that the reason people get mad back at you when you get mad at them is because their first reaction would be to feel bad/grief that they apparently did something wrong to make you feel that way, because on a superconscious level we all really love each other. But we feel we shouldn't have to feel that grief, because people often get mad at other people for reasons that aren't their fault, or we just don't want to have to feel the grief, so we get angry instead at the person for making us/trying to make us feel that way.