My take on the criticism here is that people are ignoring that Google has a lot of customers on GMail and a lot of corporations on GSuite. Intra-office email management is another ballgame and these kinds of features are pretty common in that space (Novell had them in the 90s even).
For users outside of Googles platform the obvious solution is either not to send them or to send a managed link to the message contents via normal email.
It can't be perfect thanks to the analogue hole, but it only has to be a bit better than nothing to provide utility.
