Take Erase for example, the most potent spot removal on offer and it is barely ever played anywhere
When I was a kid, there was a brief period in my play group, where half of the kids didnt want to play tournament legal decks
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Until then, paying 4 mana and then only getting lifelink and deathtouch on some combats sounds like too much effort
On top of that, being on the draw against an opposing Robber of the Rich is somewhat bad as it's almost guaranteed that itll steal a card from you, and god forbid they take your one-of win condition
This combined effect of speeding up your own progression while simultaneously slowing down your opponents allows you to leap ahead of your opponent and consistently keep your board one step ahead of theirs