The nest screen is the tricky part. This is where Apple hid the feature that allows you to be able to go to the screen that lets you set the account type. If you enter your correct email address and password here, Apple cleverly, rather too cleverly, figures out that you are setting up a Google account and assumes it is IMAP and goes ahead without bothering to check with you. Arrrggghhh!
So, what you do here is enter some wrong email address and some wrong password and then hold down the Option key!
The "Create" button magically changes to a "Next" button! Click on "Next" and you are shown the screen that allows you to specify whether you want the account to be POP or IMAP!
In this screen, you click on POP and then enter pop.gmail.com for the Mail Server, your full email address for the User Name and your password. Click on Next.
In the Outgoing Mail Server Info screen, enter smtp.gmail.com for the SMTP server and your full email address for the User Name and then your password. Click on Create.
Your account should be created as a POP account! In the Internet Account screen, the account description will show up with the wrong address you entered in the initial part of the setup. You can easily change that by clicking on the Details button on the right when the account is selected on the left and editing the Description field in the resultant screen.
I am now comfortably using my POP account and hopefully my email issues would be a thing of the past. I make sure I regularly backup my computer to prevent losing all my email in the event of a mishap. Yes, this problem is not there on IMAP. But then the other limitations make it worthwhile for me to take the risk!