I was wondering why the conventional wisdom for churning/cc signups is to apply for a number of credit cards at a single time and to repeat the cycle every few months?

I understand that it's difficult to apply for two personal cards from the same card issuer within a certain amount of time, and I understand that each application for credit results in both a hard inquiry on your credit report and, if approved, more credit being extended to you (presumably the total credit you will be extended is finite and a number some people here brush up against this limit, thus requiring credit reallocation to allow for new cc approval)

What I don't understand is the difference between:

Example 1, conventional wisdom: apply for a chase, MasterCard, Amex and b of a card on same day. Wait 6 months, apply for another round

Example 2, apply for chase today, wait 1 month, apply for MasterCard, wait one month apply for Amex, wait one month apply for b of a, wait 2 months, start cycle again.

I believe that these applications remain on your credit report for 2 years (but diminish in significance over time), but is there really any difference in the impact on your credit score or the likelihood of being approved between the above 2 examples?