That is how many professionals are training in many European countries, and they still want a diploma to go with it.
In many countries, regardless of how learning it was achieved, you still need a paper to prove that you actually did it.
And in countries like Germany, better keep all those job evaluations close at heart because they get asked for as part of many job interview processes, additionally have them reviewed by lawyers, as they legally can't say anything negative, there is an hidden language on how to express negativity which to the reader sound positive on first read.
Techbically even those hidden phrases arent permitted by law, and you have the right to get those phrases removed/have it be turned into a basic evaluation (just from when to when + what job)
The employers that do use those hidden phrases just hope they arent challenged/the employee doesnt notice.
Thats also why most evaluations are entirely written in the superlative.
Unfortunely they are common enough to keep lawyers and book publishing businesses going with dictionaries "evaluation => real meaning", exactly for that little help to go though it and validate its correctness.
Many employeers profit from foreigners that aren't well versed in these nuances, and have to be educated this is a thing.
An example for others not used to German work market,
There's software for that even. The input is a ranking of the employee on a bunch axis (1-5 or something) and it spits out the appropriate text. Does the reverse too.
"Missing" information is a huge red flag as well, though. If an Arbeitszeugnis only lists the dates and what the person worked on, and nothing about results or behavior, we would never invite them for an interview.
It could be that the employee left due to being on bad terms with the employer, for something at fault with the employer. I personally wouldnt take a basic one as that hard a strike.
In many countries, regardless of how learning it was achieved, you still need a paper to prove that you actually did it.
And in countries like Germany, better keep all those job evaluations close at heart because they get asked for as part of many job interview processes, additionally have them reviewed by lawyers, as they legally can't say anything negative, there is an hidden language on how to express negativity which to the reader sound positive on first read.