I use POP because of inertia: When I first set up a Gmail account in 2004, I tried IMAP and it behaved in unexpected ways when organizing mail locally with my o

I use POP because of inertia: When I first set up a Gmail account in 2004, I tried IMAP and it behaved in unexpected ways when organizing mail locally with my other POP accounts, so I switched it to POP and have never really had a reason to revisit that decision. If I recall correctly, moving an IMAP email message into a local directory that the IMAP account didn't know about deleted it from the server, which I did not want. But I had this huge local organizational structure for all my emails from multiple accounts, so I could either choose to exclude Gmail from this organization, reconfigure everything so that my brand-new, unproven Gmail account was the master account that controlled everything, or just turn on Gmail's POP mode and maintain the status quo. Honest question: If I have multiple email accounts, some of which are IMAP and some of which are POP, that I organize with a mail client on my local machine into directories that mix mail from all the accounts (is it even possible?), then if I change the directory structure on the server of one of the IMAP accounts, what is supposed to happen to my local directory structure and all the non-IMAP-mail or IMAP-mail-from-other-accounts, that used to be in those directories?