It’s actually much more similar to how they kept using Majel Barrett as the voice of the computer across multiple series.
And it makes sense in-universe for The Doctor to be 800 years old and still working; it’s not like they’re contriving a way for Harry Kim or Phlox to be there, much as we may want to see them again.
I decided to try to stop swearing in college, to see if it would improve my attitude - and to see if anyone would notice.
Both turned out to be true. People found me pleasant to work with and hang around. I recommend it, personally!