The world would be a brighter place if that was the case rather than Tiefling Paladin/Bard.
It's the ideal blank slate upon which the player can reflect themselves. Only if there's nothing to reflect do you end up with the 'boring' you might expect. Until you can write and perform a human fighter as an interesting character then you can neither write nor perform. The inability to resolve problems with spells or skill checks will force you to either take agency and try to actually resolve them as you would, you know, a problem, or effectively not exist outside of combat if you don't. Great litmus test of players all in all.
I understand completely what you mean, actually. And that's a GM issue, but you can easily make an argument that the book just gives you nothing to work with and you have to homebrew a system for tracking results. It's also a side-effect of 5e refusing to give you flavor in descriptions, so priests basically are wizards etc.