The best damage dealer of a damage type shouldn't ALWAYS be its exclusive. This just creates a toxic gameplay loop where anyone not spending thousands of dollars on the game has no hope of catching up. We can see this in the new season. If you don't have one of the exclusives for the new damage types, they are SIGNIFICANTLY less strong. It's alright for them to be a damage upgrade, but when they double or triple the damage of the next best thing it's a bit ridiculous.
It'd be nice if we could get more units for existing damage types for this reason and a few others.
Many of us would love to have some synergy with our existing champions but we're stuck in an endless loop of new champions are released> Get new champions> Don't get the exclusive that matches them> Try again next season because you're not gonna hit a .1% chance AND get the right one from the main banner as the pool inflates season by season.