LD is a comedy that's why it's intended to "draw laughs".
Of course LD is a comedy. But it goes beyond that.
TAS, for all its bargain-basement-budget, at least attempted to animate the characters naturalistically. It wasn't Disney-level naturalistic animation, but it aspired to be. And it wasn't (except for "More Tribbles, More Troubles," "The Practical Joker," and maybe "Mudd's Passion") a comedy.
The character design in PRO is somewhat less naturalistic, but not to the point where the very appearance of the characters is intended to be funny.
The LD character design, on the other hand, is highly caricatured, mostly of the "big eyeball" style (cf.
The Simpsons, Family Guy, American Dad, and such newspaper strips as
Garfield, Get Fuzzy, Mother Goose and Grimm, and
Fox Trot).
It's not a comedy
because it's (visually speaking) a cartoon, but rather, the producers made the conscious decision to make it, visually, a cartoon
because it's a comedy.
I find myself thinking of some familiar comic strips. I seem to recall an "April Fools"
Beetle Bailey strip in which the characters were drawn naturalistically. And I know that there was an "April Fools"
Pearls Before Swine strip in which Pastis drew Pig realistically, like an actual
Sus domesticus.