In the past, the main argument against Hypergenesis is that it was more powerful than Living End because Living End can be hated out by graveyard removal like Leyline of the Void or Rest in Peace, although this argument is weaker now because of Glimpse of Tomorrow, which doesn't need the graveyard to win
But there still are plenty of colorful Pokmon on our walls
The amount of flexibility this card added to the deck made it so cards like counterspells became much better, while they were awkward with the sorcery speed Pieces of the Puzzle
It ensures the best fit and protection for the cards
The reason why it becomes a headache when the junk speeder is blocked is that if the junk speeder succeeds in bringing in a tuner, you can secure the non-tuner and magic/trap using those gimmicks, but on the other hand, if the junk speeder is blocked, you may have to bring in a tuner using those gimmicks, so your plan starts to go wrong