Being "a jack of all trades" isn't a bad thing in my view and been a careers advisor you should be able to recognise this.
In some cases this is true, others not so much.
I don't want a doctor, dentist, plumber, electrician, teacher etc who is a jack of all trades. I want them to be experts in their particular area.
If you have experience and skills in many areas this makes you more employable and shows you are able to learn new skills and try new things.
You're confusing being a jack of all trades with developing transferable skills. And in some jobs having a wide range of transferable skills is important, other jobs less so.
May I ask @DollyTrolly have you ever had a normal job as some of the points you raise don`t suggest this.
May I ask why you keep being so rude to me? I've been nothing but patient in answering your questions, some of which have questioned my professionalism and ability to do my job. You've asked people not insult you personally. Please offer me the same courtesy.
Anyway, define 'normal' job. I've worked since I was 14 and I've had lots of jobs. All of them recognised jobs or professions so i'm not sure what you are getting at?