Their mobile website is terrible and intentionally crippled... I've found that when I'm having lots of meetings–whether it's sales, recruiting, or looking for work–being able to quickly pull up profiles of people I'm talking with while on the go is useful.
That said they badge the notifications icon in the header of the desktop web version as well–just now mine had 8 unread "Notifications", 7 of which were suggesting I congratulate acquaintances for work anniversaries or telling me about trending posts. Why can't that just be in the feed? Maybe because I don't actually ever scroll through the feed, because I don't care about the garbage people post on LinkedIn.