This thread is actually a few rants clumped into one, but they mostly follow on the mindset of newbies, so I'll try to go more in depth.
Impatient newbies. This is a big one, with newbies saying right off the bat, "How do I kill FGs?". There's quite a huge difficulty gap from AI3 to above, and FGs have their own little niche high above AI3 in difficulty. Now I know that a majority of players come from kong for the badges (I was one), but telling them to use MA, LS, or LA to kill FGs does not help. They'll just take you at your word, get enough money for a cheap deck, keep clicking FGs until they win, get the badge, then leave. We want them to stay, so giving them the straightforward way for the badge does not help at all. It'd be like playing a puzzle game while having a walkthrough in another window. They're not playing for the sake of playing, but for the sake of badges and completeness. How do we stop this? A few are determined to be badge hunters, but most can be convinced and drawn into the game of EtG if they were to fully immerse themselves in the elements, cards, and strategies instead of speeding their way to get a badge and then drop out. Encourage newer players to slow down, develop their strategies, and play with the metagame instead of just speedrunning a badge. You give a man a fish and he eats for a day, but you teach a man to fish and he eats for a lifetime. Teach newer players how to play, not what to play.