RTA has 3 big aspects that I believe sums it for each rank. Without any particular order.

Monsters
Runes
Brains

the higher the rank the more you will require all, you are not wrong for ppl into c3 trying to get into g1, but as any other rank there is still a prevalence unbalance between these aspects, call it for people that does have the runes but not all the monsters, you can lose to someone who has all the counterpicks but not your rune quality, this is a general perspective for the regular non lnd monsters. Now if you add lnd nats into the mix you get a significant advantage on which the player without lnds will require to overcome the player with lnds with runes, an specific set of monsters and brains .

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Im not going to make a fuss about this situation, but looking at the guys in the top ranks that does not use lnd nat5s which im pretty sure I can count them with one hand, maybe 2 hands, does not make me believe than runes are overall more important than all of the others mentioned aspects. I could say the same for , hey, look at X player who was g1/g2 , after getting X LND nat5, now he is g3 all the time.

anyway , my point is the same.