How I imagine a conversation with Riot would go.
How am I supposed to play immobile melees?
Riot- Build damage.
So how does that help me get to the enemy?
Riot- Don't worry they will initiate on you.
Ok, so how am I supposed to deal damage when they come to me?
Riot- Well you built damage right? That means you will deal damage!
Yea ok? but what about surviving their burst cc and damage on their initiate?
Riot- Well you don't.
Then how am I supposed to deal damage?
Riot- Well you built damage, and we gave you these awesome runes that amp damage so you can deal damage!
But you just said I can't survive their initiate, so I can't cast anything to deal damage. You also agreed that I can't initiate on them because I'm immobile.
Riot- But at least you have damage for if they don't cc you/instaburst you.