[andyjh]

Not true: Currently the "info" indicator appears on first interaction (which _could_ be after they've auto-completed everything, but may not be). This is changing though: In Chrome 68 the info indicator will be there on all HTTP pages, without form interaction required. So this change just changes it from "info" to red warning.

[weber111]

If you type fast, you can probably get a whole username (or personal name, or street address) in without seeing the red warning. (That said, it looks like it _will_ show "not secure" by default, even before you type anything in, on HTTP; it just isn't emphasized unless you enter data.)