I agree completelly with you.
Save cards is just a ingenuous form of perception, that where people dont see is by keeping your level equal to the map always, you lose more time killing the monsters to receive the exp, but if you are a level high than the map you can easily finish all the quests one after another, and the game have lots and lots of quests and hidden quests! Not to mention the Adventure Jornal and completing maps that also give your even more cards!
People think about it. The game give a minimum of two routes for the same levels (that mean, one map after another to leveling all over again), sometimes even 3 routes (close to femidian for example there are 3 routes for level 100 players), yes, you can receive cards for the same level in 3 different maps/routes.
I for example used my cards and I’m easily on the 120 lv. I dont did the hidden quests, dont completed all the maps, and I have the entire Orsha side to do it. Not to mention you always will lose 4x less time to complete quests and kill bosses.
Just never use the cards before you go a minimum of 6 times the dungeon of your level, or if you are class level 15, for obvious reasons.
People become ingenuous hypnotized by cards calculators, instead think about the time they lose if there are numerous cards to use, only needing to do quests.