Why I wish all my teammates could play the Assassin role
I wish everyone could play assassin well. Not because of the burst but the skills this role teaches. Namely positioning. Playing an assassin effectively requires knowing when to go in and when to just walk away. You can't just penta kill an entire enemy team with Kat (well you can but) and expect a good result. Playing as an assassin teaches you how and when to flank.
Now this translates to other roles extremely well. If your entire team is chasing an enemy which will eventually turn into a team fight, typically the carries are in the back so that when you catch up they are in your back line. This is where assassins shine at picking off carries because there is limited peal and the enemy team is focusing on the chase. But if the assassin gives themselves away the entire enemy team can collapse kill the assassin and then they continue chasing the previous targets or pushing towers.
However some players don't play like this simple because they don't know how. They simply chase the original target because a team fights going to happen anyway so why bother? Except it makes a huge difference because the assassin is part of they carry component of the enemy team. Your team fight is going to go so much better without them
tl;dr: The assassin position would teach players the value of positioning and improve team fighting tremendously
These are my thoughts on why I wish everyone could play the assassin role