Currently all damage roles gain access to their damage from runes at the start of the game. Tanks that take the conditioning rune though have to wait 10 minutes to gain their armor and mr. This has been a game changer for me. I usually play Leona and being that she did not get any armor and mr added to her kit (likely becasues of her w), I am just getting blown up. I started taking coin instead of relic, as I get punished way too hard trying to proc charges.
Having that armor and mr would help a lot early game. I do not see why we, or perhaps a tank jungler should have to wait 10 minutes into a game (basically half the game now) to have access to this, while the damage runes do not have that kind of delay.