There's a way to snap the window to one side or the other if you long press one of the resize buttons at the top. I'm a HS teacher and I often have my kids put two windows side by side. On the school-issued devices it's trivially simple, but it's honestly not that bad on a Mac. Just really unintuitive like everything else they do.

I think the argument is that the impulsive API change will harm many, many subreddits. Does Reddit care about quality content? Or do they care about becoming profitable? I think the mods make a lot more sense than Spez here. And I don't think you can say Reddit cares about keeping subs open if they're willing to watch them all shrivel away in a sea of spam and clickbait bots.