Lower Decks is a series that could run for 20 seasons and it wouldn't have to worry about the characters aging. Being a cartoon, it's also not under any pressure to take itself seriously. So let's say it ran 200 episodes (I'm not saying I think it will, but just as an example), they want these characters recognizable and same-ish throughout. If there is any character development, you're not going to see it just four episodes in. More like 40.
This is not my preferred way of doing things, but I can see why they'd do it here. I think Strange New Worlds will be more of the middle-ground you're looking for.
Animated characters can grow from a character standpoint without really aging, or even without changing the core character traits. Futurama is a great example.
Some of the characters on Futurama followed a cumulative progression -- i.e., things they learned, the ways they grew, and the character relationships they developed were additive, cumulative, and preserved as the show progressed. However, there was very little in the way of an overt passage of time for the characters.
Granted, it isn't serious and deep character development, but the development they DID do with the characters was done so in an internally consistent and accumulative manner over time.
Throughout Fry's journey, he has learned things and cultivated relationships that were gradually added to his character as the series went on. By the end of the series, Fry still may have been basically the very same Fry with the very same personality traits from episode one -- but he also grew to be more than that.
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