We absolutely need a better platform for professional networking. A platform that's not filled with people who dislocate their shoulders trying to pat themselves on the back for some "inspirational" social media babble about the last time they managed to send an email.
I won't disagree about the state of LinkedIn, but doesn't the content just come with the territory? In my experience, people who "network" for networking's sake the most are exactly the type of people who self-congratulate and humble brag, so you're bound to get exactly this type of content on a platform that's entirely networking-focused.
At this point LI is beyond saving but a serious competitor would have to be heavily moderated to stay clean which we all know won't happen.