Note, as other posters have pointed out, this assertion isn't actually borne out by the text. Warlocks learn magic via personal relationships/pacts with supernatural entities --which, BTW is the way a lot of Western folklore describes magic working, making 5e warlocks much closer to the common depiction of magicians.Without needing to study to learn magic like a wizard.
Nowhere does it say it's easier (or even strongly imply that it is). Hell, making a pact with a devil that benefits you without totally screwing you over sounds like difficult work. It strongly implies years of arduous legal training!
Contrast warlocks with clerics. Their spells are directly granted by divine entities, but still not described as easy. There are prayer and rituals to learn, and, presumably, plenty of made-up theology and made-up variations on Church Latin, etc.
Now if you want to decree that warlocks essentially cheat their way to arcane power in your own homebrewed stetting, well cool beans! From a game design standpoint you'll probably want to reflect that in the mechanics, ie have it actually be easy for warlocks to acquire spells & powers, gain levels, and so on. With a set of counterbalancing restrictions & disadvantages.
Or you could leave the notion that warlocks have it easier as an in-setting prejudice held by wizards, something that adds flavor & potential conflict without requiring it to be an objective fact (which opens up a can of unintended consequence worms).
Then there's the whole metagame angle. From a player's perspective, becoming a wizard and becoming a warlock (or fighter, rogue, paladin, etc.) all require the same amount of effort, ie you chose a class.
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