[joshhart]

The mobile-web version of LinkedIn and the new website are built in Ember. We already use Glimmer 2.0 because we care about web performance. So we care deeply about many of the things you mentioned.

Source: I'm the lead eng for our consumer group

[smartbit]

Just out of curiosity I logged into the mobile site. First I was greeted with "your browser is not supported". After I logged in, I found a website full of nonsense news, mixed with advertisements. Not a place I would go to for any meaningful reason.

My personal conclusion: LinkedIn is a lame duck. The previous owners sold it at the right moment to Microsoft.