"There is a way to do this" does not equate with the "average" user 1) Understanding this; 2) Remembering this especially when used infrequently; 3) Allowing themselves to be arsed with it when it's a cumbersome process.
Further, product managers and "designers" keep changing the design. Even and especially designs that were meant to convey e.g. the existence of and validity of secure connections.
Everyone wants the marketplace of "computing for the masses". Well, you need to design and engineer for those masses, as well.
To some extent, this is being "resolved" by "the masses" already being onboarded and managing, through constant exposure, to somewhat keep up.
However, this means of "dealing" with the problem leaves plenty of room for failures, some of which are pretty spectacular for the individuals and/or organizations involved.
"Secure" your documents in our "perpetually" available and backed up online storage... "Whoops", they're gone!
A blip on the map. Except for the user involved.
Obviously that's an overgeneralization but I don't know very many people who actually want to design for the masses. Converting the masses is only something we value because we know it's necessary to make a lot of money, not because we believe reaching the masses by itself is a sign of great design or innovative work. For example most developers and almost all designers I know use macs and design for macs (e.g. web typography that looks fantastic next to Mac OS UI elements and out of place next to windows UI elements) even though many of their users may be using windows.