A fine point. The big question with the non-deck building model will be:
can players keep using existing opened cards at official events or will buying new packs be required to participate?
There has been nothing to indicate this would be the case.
The chance element. That's the element that randomized card packs exploit. That's the thing that leads to "addictive" behavior. That's what doesn't add anything at the table. That's the predatory business practice. That was also my major issue with the minis.
A slot machine only costs $.50. Buying it is a gamble. And that's when it becomes kind of exploitative. And that's what makes it unwelcome for me.
And again this is where I think you're missing it.
There in't a greater chance factor to exploit.
In a Collectible Card Game, or a slot machine as you mention, the system is set up so that if you keep playing, you have a chance at greater success.
"If I just put in another quarter I'll get the big payout."
"If I just buy another booster I'll get that super great card."
They exploit your desire to win by letting you buy more and more to increase your odds.
This isn't true in this case. You have the same chance of drawing an "awesome card" with one pack as you do with 100 packs.
There is nothing motivating you to buy more packs, aside from your own desire to own stuff- And that's no more exploitative then anything being sold in any form. If you want something you pay money for it.
If you lack self control and can't stop buying them.. Well blaming WoTC would be like blaming a grocery store for you over eating.
The minis I find are an entirely different story. I never really bought them because they DID fall under the sort of exploitative practice you're talking about. In order to get the better minis for the mini game I had to keep collecting.
(I wouldn't go so far though as to paint it in as "evil" a light as you seem too, but it was still annoying.)
Also in order to get the ones I needed for my rpg game I had to keep collecting. Random chance in the case of the minis was bad (which is why I give them credit for the seeming move towards tokens.)