It isn't laziness per say, but what the artist intention is and preference.
And agreeing with @joannekwan said, the overall mood.
Is it fun and zany antics? Or overarching dark and mysterious?
A epic, elaborate story for example does not necessarily need EXTREME details.
And the same could be said vise versa.
A comic like Polyphemus is super simple, but I love the overall tone of the work and it works for this artist's desire of an adorable cyclops and a different take on a classic greek mythology, which could easily be a TON more dark given its theme.
A comic like Grassblades has a lot of detail focus on wardrobe, backgrounds, even panel layouts, but it works in it's telling of a wandering samurai, and it's the artist conscious effort in these details that does not go unnoticed.
Both of these work very well though for whatever their target audience is.
I appreciate simple comics...or at the very least comics that make their line work look super simple, because I personally am envious of it.
I kind of wish I could be less detail oriented or detail crazy sometimes, but I just have this itch to add as much details as I possibly can into each panel and it can be quite exhausting and strangely satisfying at the same time.
But overall, I don't think very little detail is a bad thing at all!