Persistent CCG environments such as this one will always reach a point in which strictly selective purchase options are required.
If Duels was a system on its own, sooner or later we could expect to get a set, from which new players could likely start over, giving them a good starting experience and enough tools to handle the farming.
Given that cards choices and set balance are made for the paper environment, instead of the limited port we play, new tools could very well harm starter shells.
Kaladesh was a great example, seeing how returning players were able to go back in top shape, just by coupling Origins with the new aggro tools. A set like that also allows players to stockpile resources for future investments, with more ease than older options.
All in all, new players are indeed required to inform themselves about the current meta, looking out for brew options and various guides; otherwise they seriously risk to gamble their limited resources onto plenty of sets, getting no love from RNG.
Provided the information, new players can navigate the game's economy and RNG without harming their play experience.
Therefore, if they simply implemented that single cards purchase or any similar selective purchase options, instead of only the RNG base option, new players would be more enticed to join, and the gaming experience would be far better.
The kind of Gold Farming and booster system we have, are quite generous options, but at this point there's need for some more.
Also sexism and patriarchy.
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