That's a fair point and true. But i was thinking more about character appearances. There are three characters from Voyager so far (Seven, Icheb Janeway), with the plan for a additional appearance of Tom Paris in Season 1 of Picard (that didn't happen), and not even one from DS9...
Well, I think you're over-stating the VOY characters thing just a little bit. They only brought Icheb back for a short scene in "Stardust City Rag," and that was to set up Seven's emotional arc. It's not like they spent a lot of time on him.
That leaves us with only Seven and Janeway. With Seven, it makes sense -- it gave them an opportunity to establish a new level of depth and complexity for the character, and it tied in nicely both with the Borg Artifact plot element and with the larger theme of societal decay PIC S1 was dealing with. It was also an opportunity to bring back an enormously popular character and have her interact with Picard for the first time.
As for why Janeway gets brought back but not Sisko, I think that issue is twofold: 1) DS9 ended with Sisko essentially as the space version of King Arthur going to the Isle of Avalon to return in Britain's (Bajor's) hour of greatest need; 2) Avery Brooks has made it clear he's not interested in reprising the role.
I can see why they might want to bring back Paris. He has a really interesting background premise, but VOY kind of emotionally neutered him by making him into a generic good guy Riker clone. If you're doing a story about former Voyager crew members whose lives fall apart the way Seven's did and then get involved in life in the lawless former border between the Federation and Romulan Star Empire, then Paris would be a good character to use for an arc like that.
I think a lot of other DS9 characters were also left in a state of emotional resolution that VOY didn't necessarily give to its main cast.
I wonder if it's generational? People who were kids or teens when Voyager was on make up a larger percentage of Netflix's audience?
I think that is at least part of it. One really prominent example is United States Representative Alexandria Ocasio-Cortez, who has written about how Kate Mulgrew's portrayal of Capt. Janeway on VOY was a major source of inspiration for her as a child.