YSK: You don't need Gmail to create a Google account
Why YSK: A Google account is not the same as a Gmail account, and you don't need to create a new Gmail email account to have a Google account.
I've spoken to many different people who equate a Google account to a Gmail account. This is not the case. Unfortunately, this leads to many new Gmail accounts being created, solely because they think that they need to have a Gmail in order to access other Google services.
Here's the gist:
A Google account gives you access to Google services like Sheets, Docs, Calendar, Drive, Photos, Gmail, YouTube, etc.
A Gmail account is an email service account with Google. When you create a Gmail, you also create a Google account by default.
However, the reverse is not true. If you create a Google account (with a non-Gmail email address), it does not automatically give you a Gmail account.
If you already have an email account with another provider, you can use that as your Google account.
For example: Let's say your email is jane@example.com. Rather than creating jane@gmail.com, you can opt to create a Google account with jane@example.com and avoid creating an account for Gmail.
Unfortunately, Google tries to get you to create a Gmail account during the process of creating a Google account. (see image).
It's important to differentiate this and prevent people from registering new Gmail accounts unnecessarily.
No real harm, but it's one more account to manage/worry about.
Flipside is that relying on a singular account is also bad, as now it's a single point of failure in regards to security.
You're making a new account either way. Whether you login with a gmail or other email address makes no difference to it being a Google account. Making a gmail you ALSO get another email, which you can promptly ignore until some possible point in the future where it may be useful.
I mean if you make a gmail account just for your Google account, you'll either have to log into your Gmail account to check emails or miss potential important emails related to your account, which you would get if they were sent to your main email.