Yeah the card games should be like skins in CS:GO if you know what CS:GO is

CS:GO Is a FPS shooter game
Where there are SKINS for Weapons ingame.

Some skins even cost around 20k-40k$ What is huge amount of money.

but even if you have the rarest and most worth skins. It won't help you in any way become a better player at the game.
The skins are just for looks and flexing.

I feel that card games should be the same in the blockchain community.

Just like you said in your post that rare cards shouldn't give any advantages to the players.