"It was ever thus!"
I worked with young trainees in the 80s and became responsible for recruitment/training of trainees in the 90s. They were a mixed bag back then too. Lots were poor at communications, lots struggled with routine, following instructions, lots were incredibly immature.
The thing was that most of them turned into "functional" adults within a couple of years of working in the workplace, side by side with adult/experienced staff, being forced to deal with clients/customers by gradually easing them in, ensuring they saw and listened to how other staff communicated with clients/staff/customers etc., so they could emulate the kind of conversations we had with third parties etc.
It was "a given" that those straight out of school or uni were likely to be "raw" in an adult workplace and all the other staff really didn't expect much from them and all kept an eye on them, helping them when they struggled, stopping them from doing stupid things etc. The main thing was that we checked they were improving and making progress as the months past - those who didn't were let go.
Yes, "some" arrived on our doorstep a lot more confident, able, etc., but they were a minority.
I remember one of the trainees we took on straight from uni who was very "rough and ready" - barely able to communicate in person, scratty/untidy appearance, barely said anything more than the occasional grunt and absolutely no obvious personality or interest in talking to people. After a couple of years, he'd turned into a star employee - started taking care of his appearance, always clean shaven, started wearing a suit and tie, built up his confidence to talk to anyone freely, etc. It was really lovely to see his development, both workwise and personality wise.
I think things are a lot worse now due to WFH, online training courses, etc., so that youngsters don't have the same 9-5 five day exposure to their work colleagues - building their confidence in communications, their abilities in the work place etc is obviously going to take a lot longer if they're not "immersed" in face to face workplace, face to face courses/training, etc.
We really shouldn't be blaming the youngsters themselves for the awful environment they find themselves in. Those graduates entering the workplace today suffered from the disruption to their education due to covid, schools closed, locked into their uni flats with no face to face teaching, the revolutionary change repivotting business/professional training courses from face to face into online (which has never reversed to how it was pre covid etc).
Due to poor trading conditions, increased taxes and employment rights etc., fewer firms are taking on young staff, so jobs are harder to find.
Today's youngsters who struggle would mostly benefit from being in the workplace, being around adults in a professional environment, etc. It's not their fault there are no jobs for them.