[philote]

I think it's just like anything that's gotten popular. SPAs are all over the place now, which means there are plenty of bad implementations along with the good ones. But generally you only notice the bad ones due to frustration. This isn't SPA-specific IMO. I've seen plenty of server rendered pages/sites that were also poorly done back when those were more the norm. Heck, I still help maintain a set of CGI scripts that are horrible and slow.