"Other than its extensive add-on ecosystem, there is little reason for most users to choose Thunderbird over Apple Mail."
I was a little put off by this comment. It makes Thunderbird sound like an old horse ready for the glue factory.
If you are just a casual email user, none of this article is probably relevant to you. OTOH, if you spend more time in email than you care to admit, Thunderbird is an awesome choice.
the comment concerning "its extensive add-on...