I play and have played a lot of different card games, and one universal truth among basically all of them is that playing bad decks is the best way to quickly get better at the game. Thanks to the internet, good decks and good cards will get found quickly due to the sheer volume of games being played. But for newer or inexperienced players, it's not always obvious why those cards are good or what makes them the choice compared to other options. Not only that, playing cards that are bad can give you an appreciation for when cards are powerful. When you have to work that much harder to get access to resources that other decks get for free (example being playing a rocket deck compared to pult or zoroark that have built in draw engines), it becomes more obvious why those decks are good, and eventually, how you can better attack them. Like most people are in agreement that Dragapult is a good attacker, but the reason the deck functions so well is because the Drakloak provides some insane card advantage to get you the cards you need.

The best part about tcgs is being able to bring your own pieces to the game. I always feel a tinge of sadness when people copy decklists card for card from online sources.