Is it worth learning every champion? Not to master all of them, just learning every abilities, etc.

I'm a pretty old player, though I never played ranked (it's just stressful and it sucks out the fun out of a game). And i just thought what if I try to learn every champion, like i know 90% of champs abilities, and like 50% of what those abilities are doing, but I didn't played ALL champions and there is that 50% of unknown xD. {{sticker:sg-lux-2}}
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