The functionality that linkedin has is sufficient in my opinion. It is the way in which people use it that has decreased its value for me. It has simply become a B2B/P2P marketing platform. Ultimately things like FB, Linkedin, etc... will fade out due to it not being focused enough.They will keep generating ad revenue, HR, sales/marketing departments but there will be better solutions for professionals. I think over the next several years there will be industry specific solutions that prove to be more effective.
Ultimately you just don't like their UI, and want to experiment with making it better. Just do that.
Angel.co is on its way to compete with linked in ..check out features its been adding