It’s just like sending an E2EE message in WhatsApp, Signal, or iMessage in this regard.
The problem is nobody uses it.
The feature will also come to Google’s iOS and Android apps.

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But this time, it might actually stick because Gmail is so big.
Open Email
Emails strength and weakness are that its open.
But also open like a door.

While the connection between your email service and your system might be encrypted, your email is not.
Its just a plain old message, viewable to anyone along the way.
If youre using a non-Gmail email address, youll have a useless lump of data in your inbox.
Multiply this by the number of people you communicate with, and youll see the extent of the problem.
IMessage, Signal, etc., can be locked down because the vendor owns the whole chain.
But the downside is you’re able to’t send a Signal message to a WhatsApp user.
The messages are in privately-owned silos, unlike email, which is distributed and open.
“However, it’s strongly advised to NOT send sensitive information via email for this very reason.
In the end, I’ll take email as it is.
I like that nobody can take it away from you and that it’s so flexible.
You just have to remember it’s totally insecure and to never send sensitive information.