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Because in Commander there are various types of threats, target removal needs to be more flexible in order to be able to deal with multiple different kinds of permanents and spells

Additionally, the secondary market for digital cards is more competitive and volatile, leading to frequent price drops and bargains for savvy players

Permanents, spells, and abilities can also target any player around the table (as long as they don't explicitly say they must be used on "you")

Ishkanah, Grafwidow Spider Tribal Commander If you really want to play a lot of reach creatures, you might consider playing Spider Tribal Commander with [c]Ishkanah, Grafwidow[/c]

That said, while Exploration, Burgeoning, and Avenger of Zendikar are amazing in the right deck, theyre not essential to winning games and many decks dont actually need or want them