In TNG/DS9 it would have been more expensive filming wise to show holograms that were less "real"With Discovery holograms they didn't feel real in a "this is a person standing right in front of me" sense but in a "this is an NPC" with limited animations or articulations.
Obviously DSC has a much bigger budget and more time to run vfx and more post production time, so it all evens out I guess.
Section 31 in DSC only revealed themselves because of the Red Angel and Control threats. They were pretty sophisticated but got taken over by their own AI.My biggest problem with how Section 31 has been used since Discovery is that they're either shown to be buffoons who do stupid things (which is the total opposite of the nebulous organization in DS9 that could outsmart genetically engineered intellects and was capable of executing a genocidal plot), or they're supposed to be a secret organization that's not a secret with their own black combadges.
Not buffoonery at all, IMO (ok, maybe a little).
We don't know (and I rather suspect not) if S31 are going to be walking around with name badges in the movie and declaring themselves Section 31 every 5 minutes. The audience knows but no one else does who doesn't need to.
And we don't have much on the plot yet, so it seems pointless to assume that they're going to be flying around with ships named "Section 31 [SHIP NAME]", it will be all sorts of clandestine and intrigue most likely.