Is there any benefit in having extra credit cards? Even by the same company?

12 hours after paying my bills, my credit card company emailed me to let me know I was pre-approved for a new card with a higher limit. I accepted because I thought it could serve as a back up plan if any of my current cards get declined for some reason. But in general, I don’t think it is that useful to have multiple cards. Since I can’t spend more than I have, regardless of how high my limit is.

Is there any benefit in having extra credit cards? Even by the same company?
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