Fascinating . . . reading the comments, it seems like the vast majority think this is a long overdue change. For myself, it never occurred to me that there was any issue and I'm slightly unsettled by the change (i.e. it is far from obvious to me that it's a good thing). It is not something I've thought deeply about, of course.
I expect there's an audience selection bias at work: Fewer greybeards and more spiky haired teens reading HN.
I think it's an awful idea. Apart from making things less secure it also makes sudo's UX inconsistent with most of the other coreutils. Luckily, I don't plan on doing any more ubuntu installs.
Just so you know. I feel the same way!
Because you long forgot how confusing it was, that you can't see if your keystrokes are accepted by the machine. This is a change for people, that are new to Linux/Unix