No it doesn't, Dax went unjoined for over a hundred years before joining with Leela. Tobin was next, no earlier than 2226. They're there, just off screen. Just like Andorians and Tellarites being almost completely absent in TNG, DS9, and VOY.
Where do you get that from? I mean that Dax waited more than a hundred years before the first joining. Plus how come that Dax never refers to that lengthy period of his/her life?
I don't know. But what does it matter? DS9 never said when Tobin took over the symbiont either. When did they ever say when Trill/Human first contact was made anyway?
Memory Alpha says that the joining with Leela took place in 2168. That's a bit earlier than what you said.
I know people don't like the novels, but the Enterprise ones have the Trill visiting Earth openly and even joining Starfleet in the pre-NX-01 era. One of the Dax hosts worked with Spock's grandfather during the Romulan War to help start work on what would eventually be the Constitution class. So them not knowing about the Symbiotes until 2366-ish is kind of hard to believe. Some of them joined the Starfleet Medical Exchange program for goodness sake...
I'm gonna have to call shenaningans on Memory Alpha's dates for Lela's joining because they definitely don't work out.
They don't match "conventional wisdom" (and also moves Iloja of Prim's exile into the 23rd century). They are based purely on a computer screen in Equilibrium. You can see some talk about it here.
I wonder what the seismograph's look like from all the moaning and whining coming from people's basements?
I personally dislike the characterisation, the captain just isn't believable as a credible representative of the federation, especially with all those facial piercings....not to mention the way they linked the Kelvans as creating V'ger to scout out the galaxy. As for the tribbles being a borg construct.....harrumph, its not real trek Oh yeah, none of us have actually seen it....
The tribbles were actually miniature dominion spies, that's why they hated the Klingons. The founders really hated the Klingons.
The worst thing about Discovery is that the time it is set in eliminates the possibility of certain plots - mainly, anything that threatens the existence or survival of the universe, the Federation, Earth, Vulcan, or anyone, anything, or anywhere else that we know still exists later from TOS-NEM. And there is no feeling of progress moving forward from NEM. Those are the reasons I tend to dislike prequels in general though. And as long as they don't intend to try to hang the drama on any of that, or do poorly done you-didn't-actually-know-what-you-thought-you-did crap (well-done versions of this, OTOH, are welcome to an extent) then I'm more than willing to give the show a chance, anyway. I could be down for that. I've always had a soft spot for the Altair system, ever since Choose Your Own Adventure #7.