Haven't read the article but I've seen numerous complaints on Gamefaqs about how the medal draw system works in NA, lack of Mickey&Brooms medals, absurdly low chances to get epics and illustrated medals, etc. SENA has been slowly making features more accessible, changing entirely how the super epic rare medals work (Present in all epic carnivals, actually something really good of them to do)... Either way, the point is they obviously cater to the whales. Which all in all... Is only logic.
Now, I agree that it kinda sucks to be f2p in this game(I am, and it's such a chore at times), but it's easily possible to make your way through Story Mode(So far) without having to spend a cent. The game gives you free login Jewels and once in a while, Jewel Quests(Which are way less generous than JP as well), and in the end, that's enough.
No, it's not enough to rank high in the Coliseum or in the Lux rankings every month/week, and hell, not enough to beat the high score challenges. But they give you options: You either spend thousands (yep, THOUSANDS) of dollars to guilt some medals, make enough draws to get those right medals for the high score challenge, and basically waste resources on what's essentially gambling, or just deal with the fact that this company is not actually here to give you what you want for the money you give them.
Basically, SE sucks for not giving guaranteed medals EVER and making good shit inaccessible, but also anyone willing to waste their money on this flawed system is just not thinking straight. You can do story mode just fine without wasting money, why the hell do people feel like they even need to do all the other things unless they can ACTUALLY get stuff they want?