posted 8 years ago
In general I do not see media-rich emails, due to a series of conservative choices on my part. My particular combination of email client and security software default settings do not allow much display of non-text content (due to abuses like tracking pixels) unless I hit various buttons designed to whitelist media content from trusted parties. Although Permies would certainly be one such, I typically don't jump through the hoops necessary to allow media unless I'm pretty highly motivated to receive media-rich emails. I mention all of this not because I think my curmudgeonly ways should matter to the decision, but to illustrate one potential problem with media-rich emails: including the media has the potential to reduce the number of people who actually see/view/engage with the mail.
In general I think best practice for emails is to keep them as simple as possible. Text and links remain the universal common denominator that everybody can receive, view, and interact with. Every media-rich feature you add, subtracts some percentage of users from the universe of people who will be able to receive/view/interact. So I think it's important to be very clear about what are the benefits to the sender that outweigh the inevitable loss of reach.
Just my two cents!