To nitpick: extensions using manifest V3 can in some cases allow better control of permissions granted to the extension.

This way the user can feel more secure about the extension not doing things it didn’t advertise.

In those cases I would say that’s genuinely better for the user. Wouldn’t you?

Not all extensions are AdBlock Plus which (as an exception) have very specific needs not covered by manifest V3.

It’s not all black and white. Google is not all in the wrong here, even though their motivation is obvious.