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If you think it's bad here, you should see some of the other credit forums. The $40K in CL across 14 CCs DW and I are juggling are gonna get simplified by setting the payment due dates to two dates. Half on the 15th and half on the 30th. If you juggle more than 1 or 2, you should do something similar.
More CCs means more leverage against one's CCCs. If they know you have 5 or 6 other CCs with several thousand in CL on each, one may be able to pressure a higher CL and/or lower APR. Works with some, not so much with others.
More CCs is also a form of insurance. Banks get bought and sold all the time. That one CCC which is judged best in the world by whomever might get bought by the worst CCC in the world tomorrow. Just like with investing, not all the eggs in one basket.
There are anecdotes about people who have 2 or 3 CCs, they've kept them for years, and they have FICO scores in the 800s. However, I find many more anecdotes about people who've been forced into mandatory arbitration, had judgments against them, or otherwise fallen into Credit Gehenna when they either never owed the money (like if they were only an AU on a CC) or the account was never late. Some of these might have been mitigated by more CCs.
I think it used to be true that one was safest with just a few CCs. These days, and not just as someone who has climbed outta the Pit of Credit H*ll and is still crawling over the rim of the Abyss, I think more is better.
People can get into trouble with just 1 or 2 CCs. But if you can manage 1 or 2 CCs, then you can manage 5, 10, or even 20.
As for mortgages and car loans, we're a much more mobile nation today than say even 15-20 years ago. Might not stay in that home for 30 years.