A lot of resources out there are wrong, inaccurate, or not reasonable for your particular context, and it requires a reasonable amount of algorithmic intelligence to be able to sniff out what's appropriate.
If I had a dollar for every high-upvoted SO post that misstates a problem or doesn't offer proper caveats... but I can make that judgment because I've already thought about a related problem in the past.
It's like asking why one should learn how to write properly when Grammarly and spell checkers exist, or why mental arithmetic is useful when we have calculators—at some point those your tools will be inappropriate or unavailable. Search tools are force multipliers, not replacements for personal knowledge and intuition.
