Spell cards tend to be the more powerful cards in the game, and getting rid of them completely stops a whole bunch of strategies, sometimes leading to basically instant game losses
Most collectors who break even or profit from sealed product opening are doing it on sets with multiple high-value SIRs (Charizard SV151, Umbreon Prismatic Evolutions) rather than sets with one flagship SIR and bulk filler
To get the tasty details on how things came to pass, go farther back than Phyrexia: All Will Be One story if you can, and check out the flavor in the lore and story summaries
If you wanted to buy the Commander precons, you had to order one of eachyou couldn't just buy copies of a single Commander precon
It did recently add in a copy of Cancelling Cologne [Astral Radiance] to help get around Pikachu ex (and some other annoying Pokmon), but otherwise is the same old build that has proven its success
From the side, the fake pair sits noticeably higher, and from above, it loses that knife-edge taper