Composer99
Hero
Each of the classes is presented in the PHB with a more or less default nature. In 5e, where the rules are holistic (hence their being written in natural language as much as possible and with little strict separation between "flavour" and "hard rules"), those can be considered a definitive summary of what a ranger is and what a ranger does.Who says I trained to be a Ranger at all? For the most part the class and subclass should provide the mechanics, not the character. I realize some elements need to be tied to a story but most of it should not be.
What if I want the mechanics of a "loner" but I want to play a flamboyant socialite ladies man who knows women in every city?
If you want your ranger to deviate from the default presented in the PHB, well and good, but it is simply a fact that the class and subclass in 5e provide both mechanics and a default flavour.