I worked at a computer store for a few months. Tools like PC part picker likely aren't always 100% accurate... And, even small things like cases can cause issues.
And, you still can have weird issues. I bought an omnibook and was getting random stalls. I'm still not sure it was fully because I didn't have enough ram. You shouldn't, but it does still happen.
Nobody is forcing you to buy it. But a lot of people just want a turnkey solution (like I said) where everything just works with minimum effort. I actually play games on a 4k tv.. using a rog ally.
It's not like steam likely won't update their steam machine specs again when it makes sense either. It's unlikely they'd run the same cycle length as Xbox, Nintendo or Sony
At the very least, I think part of the reason, like the steam deck is to kick off other similar products too. Even if you don't like the steam machine there will likely be others which are preinstalled and target steam
The real story we should be focusing on is that she openly hates attributes which exist in the majority of Australians.