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I see nothing wrong with three major cards with 15k limits. You have redundancy, and you're backed up when you encounter a charge that's larger than usual.
It's possible that your backup cards might not be the best rewards fit for a transaction. But that's OK. The main idea is to be able to expeditiously pay the merchant.
Being a backup for large purchases might be where a high-limit Discover or BCE would fit in. One reason they work well as backups is the fact that they're tolerant of unused limits.