Earlier quoted context omitted.
You're probably not a user of the average PC and internet connection out there. On low-tier equipment well-designed can turn very quickly into utterly frustrating. But you are right about the last part...when the user's UI locks up for a few seconds your email is certain to grab their attention. Just not in the way your carefully designed newsletter was intended to be remembered, though. Plain text mails work better…
Not to be overly cynical, but are people with low-tier equipment the ones that marketers usually care about? It’s not really about what ”works best” for the average recipient, because these emails are not sent out of the goodness of the senders’ hearts. If data show that fancy HTML emails translate into more paying customers, then that’s what drives these decisions. It’s of course possible that this is not the case,…
Yes - they generally are. Sure the newest SV ETL pipeline might be catered towards folks with up-to-date hardware, but most marketing is directed toward having a large reach and you'll find that the distribution of gullible people is pretty even society wide - and so those low performance having folk actually do compose a fair chunk of the intended audience.