Sure, they dont set up domain as easily as the Triomes, but a mixture of shock lands and surveil lands to find with fetch lands not only gives you access to mostly perfect mana, but control over the top of your deck
Pocket size matters too for thicker cards (Mega ex foils, full-art SIRs) the standard 9-pocket page can be tight, and a toploader binder gives the rigid spacing that prevents long-term warping
Lastly, the Registry allows me to send my collection to card shops and bulk graders, so they can help me find the elusive cards I still need to complete my sets, like that Fighting Energy in a 9.5 from 1st Edition Gym Heroes, which only eight people sent in to grade, and I need to complete my set
Kawaguchi interview (2000): "1" ("For the first year and a half, Tajiri-kun brought in prototypes, but then he stopped working on it.") Hatakeyama & Kubo (2000), p