Surprising level of transparency here when it’s very easy to just ignore these kinds of questions, even if it’s a bit roundabout.
“[W]e have to take into account numerous factors to make sure that boosters packs are equally desirable. One of the biggest factors is the overall average powerful level of the cards.”
Translation: no one would (theoretically) buy “under-powered” Standard boosters if they were the same price as “high-powered” masters boosters. This doesn’t really appreciate players who want to draft or want Standard cards (and would therefore buy Standard packs regardless) but I’m sure they have people there doing this all day every day.
The distributors and retailers need to know they won’t get stuck with unsold product. If there are different packs with different power levels at the same price, the worse one goes unsold. That makes the retailers order less in the future.
This is a commercially developed game that exists to sell packs. The job of Maro and the rest of the team is to make a game that consistently sells packs, so retailers will want to carry it. That’s how they pay the artists and playtesters and all.
That’s just what the game is. If you don’t like “gotta sell packs”, well, chess is a pretty neat game too.