Harry Kim had a personality. He played the clarinet. He was close to his parents. He left a girlfriend at home. He was good friends with Tom Paris. He was almost universally terrible with women. He didn't have character
growth, but he had a character. Frankly, a lot of people are stagnant through their adult life, so his portrayal was very realistic.
The same is not true in Discovery. Does Saru have any hobbies? Has Tilly dated someone seriously? Does Stamets have any living family? We have no idea, because the show is so stingy with the sort of "Piller filler" earlier Trek shows had. It was crammed so heavily with plot that it didn't step back and let us know much of anything about the characters - unless it somehow interfaced with Burnham's arc. The one major exception was Stamets having his relationship established with Culber - which had a few sweet moments. But once the series checked off the box of "gay relationship established" it was essentially jettisoned.
I don't care if the characters had an arc during the season really, because I don't know much about who they are yet. They still seem more like archetypes to me than plausible human beings.
Hell, lemme give you an example of what I mean. On another forum, someone linked to this scene from DS9:
This is a great scene, because in only 90 seconds, we get a great reinforcement of character traits of half of the main cast. Quark is conniving but lovable. Worf is angry and has no sense of humor. Odo is perpetually exasperated with Quark. Kira flies off the handle. O'Brien's just an everyman with a job to do and wants to get back to it.