this game needs some sort of practice mode where you can try out different scenarios and stuff. how many times have i asked myself "will this work like that? how do i counter this" etc
Hmmm good idea. But hard to implement. Imagine how many thousands cards and scenario there would be?
However, on your second question, they did implemented it by having gladiator island event, which noobs called a trash event. You can practise against different meta decks from that.
Gladiator Island event is called trash because it's supposed to be not a pvp event, yet it might as well be, considering everyone can just set a meta pvp deck as their defense deck.
not exactly, some decks are more dependent on duelist skills so it may be an advantage for some but worse for some PVP decks...By the way I would agree with the practice mode idea..