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You can't choose one land and have it untap four times, for example

Companions did not take up a slot of the 99, thus it would have been an auto-include in any deck that would have been able to run it, though this was spotted by Wizards before the release of Ikoria and hence received a day 0 ban

Theres a Necromantic Selection for a creature board wipe, and a Casualties of War for destroying creatures, artifacts, enchantments, lands, and planeswalkers

Exploration, Summer Bloom, and their ilk can turn a Loam into a pile of additional lands extremely quickly, while you can at low cube-inclusion costs include all sorts of payoffs for playing lands that allow you to generate value above and beyond the mana the lands produce