I often get asked something like:

"Why work on email clients? Isn't Gmail what most people use?"

The answer: a ton of people use Gmail and O365/Outlook. So many that it is endangering the email standard. But Email is the most decentralized communication technology out there - and great clients help protect that. So that folks can have a great email experience, regardless of the server/provider they use.

Protect email. Use Thunderbird.