I love DS9 but I don't think it took
that many chances.
Strong continuity - That wasn't taking a chance, it was a) the result of the show takingplace in the same area of space for its entire run and b) what was getting more popular in tv anyway. With how much Voyager is criticized for its lack of continuity it doesn't look like DS9
New style of sets - TNG did that too despite still being a federation ship, compare the hotel lobby look of the Enterprise D to the TOS movies.
A different style is usually used to differentiate productions, to give them their own identity especially if they are produced concurrently. But despite that DS9 still used a very recognizable TNG style for the runabouts and the Defiant because despite the need to differentiate itself the show also wanted to feel familiar.
Non starfleet characters - Wesley and Guinan on TNG, Neelix, Kes and Seven on VOY, T'Pol and Phlox in ENT. They all had them, DS9 deserves zero credit or recognition on that front.
Using established characters - For regular characters DS9 was the first to have the opportunity to do that, it simply wasn't an option for TNG and for Voyager it might have felt a bit too "small universe" and I don't think there were characters they could have used with Michelle Forbes clearly not being interested.
TNG and Voyager did it for guest appearances though.
The starfleet look staying the same - That was because they shared costumes, props and sets with the other shows.
This probably sounds like I'm shitting on DS9 but I'm not, it was a very good show but they still played it realitvely safe, there was a bit more ambiguity to the federation's actions but that was largely done via section 31 which the "proper" starfleet heroes were very much opposed to.
If DS9 had actually taken chances O'Brien and Bashir would have been lovers cheating on Keiko. Two of the main characters in a gay relationship and portraying their actions negatively would have been a big deal because it would have pissed of both sides, conservatives because "omg, gays on tv" and liberals because of "omg, awful representation by having them cheat".
Having Terry Farrel kiss Susanna Thompson is not taking a chance because lesbians are more easily accepted and the entire thing was not even framed as them being gay or bi, it was the slugs in their bellies remembering being in a straight releationship.
Discovery will obviously change a lot by necessity:
- It's 2017, they cannot do a show in the style of TOS or TNG without looking dated right out of the gate.
- The old sets are gone, even if they wanted to, redressing the Defiant bridge as alien vessel #34 isn't going to happen.
- Star Trek is pretty much dead as a tv franchise at the moment, back during the 90s the goal was to keep the audience they had, now it's to find a new one.