At a version when you want to know boss HP but they said it is too convenience, not challenging and you hope for a 2x exp card?
What about we limit the cards to below lvl 120? and you can't use it while in a party to prevent leeching? This will give a boost to newbies who can't fund leeching
Implementing 2 exp card will give advantage to everyone not only to beginners. And if the card is implemented, it will cost to buy the cards. It won't be free to specific people. The current exp gain is balanced. I am pretty sure most people can agree to this. No need to change something that's no problem when we have much bigger issue to fix. I know you want to level up to lv 120 asap but why don't you take your time and feel nostalgic experience again
To add on ^, assuming 2x is released (which it won't), it will be unfair to everyone else who've trained to where they are.
Also to answer your question they did not have 2x EXP cards in the old source (unless it was to compensate for rollbacks, etc).
If only those a-holes at Nexon had as much foresight as your post. Went years without any cash shop items having a benefit to people in game, and then Nexon just started dumping p2w crap all over the players. Everything players had earned the hardway became trivialized due to gach/2x/cubes etc etc. Personally I like the idea of not having 2x cards around. They caused me too much stress trying to min/max my training in those 4 hours to get as much benefit out of the card as i could. I would rather not have that again.