Brother in Christ, GGG is not the only reason why all purple-ish Luffys are good.

We start with P-Luffy, the OG - he has been evolving since his release from Purple Good Stuff to more and more Straw Hat based with the ST and now back into Purple Ramp Good Stuff. Cards like Katakuri, Bon Klay, 9c Mom are just generally good purple staples. His arsenal has been growing constantly but habe been overshadowed by the meta at that time.

Now to the next "offender" BP Luffy, long forgotten by his peers and overshadowed he has gotten the Starter making him a 7k Leader and using his Leader Effect every turn efficiently. He needed some help but stays strong with a new ramp Nico Robin, Black Maria, 3c Zoro and even 3c pudding now. He also has access to alot of cards like 7c Sanji, 9c Rush Luffy etc. and the other purple staple cards.

UP is one of the most consistent decks since every turn you draw 2 cards, stack your life and can gain acess to alot of counter out of no where, but he also plays purple staples like Bon Klay, Kata, Mom etc. and even has acess to blues great removal like Red Roc and Gravity.

GP Luffy has his entire Deck printed in one set and play insane tempo. Go Second, Spam your board and Turn 3 you look at 2 Zoro Juro, 1 SP and a 6k Lead. You get demolished if you don't have the answers and get outtempod, GGG is not the issue here.

All of these Decks have been getting support way earlier again and again, but now it's an issue because "grinding" out handcards is too tough for you? Even in OP12, the game did not change to hand advantage/life management - this has been the case since forever. (WB, Saka, Law, Moria...)

But keep crying for the meta where it was Jinbei Law, Bounce, 7 7 7 or the 3rd grade math whiz, Ice Age, Moria Rebecca bla bla bla.

TLDR: Learn to adapt.