1 pointIt's easier when you contain all your mailing work in one single location instead of spreading calls to it throughout your application. It's perfectly acceptable to create your own mailing class that uses PHPMailer to do the work. Don't worry about those files. It should be mentioned somewhere, but otherwise it's mostly implied.
1 pointYou're reading from some old documentation. PHPMailer\PHPMailer\PHPMailer looks weird but it is correct: the first "PHPMailer" is the organization, the second is the project, and the third is the class itself. https://github.com/PHPMailer/PHPMailer/blob/master/UPGRADING.md
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