[begriffs]

> a huge headache to set up

OK, but "huge headache" is somewhat exaggerated. For many clients, gmail connection settings are a preset option, where you enter a username and application password. It's a one-time configuration.

> outlook

My condolences.

> my 6+ separate computers

You are perhaps an outlier? But I can see how it's a hassle in your particular case.

[system2]

Outlook type of software download all of the emails. Which means gigabytes per account. I use multiple google emails (gsuite), and this makes things harder.