And that's the whole premise of the thread.In 5E at least this is the background IMO. By the time you get a leveled class, you are beyond basic training. A soldier background is basic training, a fighter is special forces out of commando school
Could you make a character class where the PC only went to basic training and an advances more on their background skills and general luck than the training that they went through?
Would you play a class who advances their everyday background skills to fantastic levels and relies more on luck while still keeping up with standard D&D classes in power and contributing to a party?