No one likes it and it takes over 20 minutes to "build" the code from scratch.
We're talking about frontend code, mind you.
At a certain level in LinkedIn, someone decided to standardize on Ember. Fine. But there were many issues, and instead of finding a more suitable and workable pragmatic framework, LinkedIn is instead deciding to hire Ember people to fix up their framework so it's actually useable. We really do work in the only industry where you can get hired to fix a mess you created yourself.
Anyway, besides the recruiter app, is LinkedIn really worthy of a SPA experience? Last time I checked isn't most of the traffic a quick "accept connection" or reply to inmail, or maybe check who viewed your profile bounce? Does the average user actually spend time in it? Probably not.
I'm reminded by a certain quote from a friend: "At a certain level in McDonald's, the managers start thinking of themselves as restaurateurs, and not fast food servants."