With Gmail's spam filter being the way it is, email deliverability issues because of 3DES are probably invisible next to the normal email being silently discard

With Gmail's spam filter being the way it is, email deliverability issues because of 3DES are probably invisible next to the normal email being silently discarded. Users trying to send email to an outgoing SMTP server that hasn't been maintained this decade may see a warning, but I doubt there are still that many broken server out there that can't be replaced or updated on short notice once the domain admin gets told Gmail can't reach them.