Sorry, Timo, but you're just nit-picking way beyond the usual kinda Nits. I get that it bothers you, but I'd rather spend time trying to 'Explain' why something seems off, than constantly pointing out that it is. For me, it's a lot more fun building something up with semi-logical explanations, than tearing it apart with negative conclusions.
Well, it's something of a Mirror Universe moment for me, too - I usually go for the bullshit rationalizations rather than the embarrassing author errors as well. It's just that
a) there's nothing to rationalize here until somebody bitches about it, so I sort of feel duty-bound, and
b) this thread is about novel phenomena, and here we have one...
The shuttle journeys in TNG are explicitly at warp, or they make NO sense. Geordi is on his way back from a conference on a Federation world. He's ambushed by a Romulan Warbird. If he's at impulse, they just decloaked within a Federation system...
But he explicitly is (the stars are still, and there's no dropping-out-of-warp dialogue or alert or shake or whatnot). And they did. This is not contested.
Furthermore, he's traveling in the one TNG spacecraft that has been labeled as warp-incapable onscreen, the tiny Type 15 shuttlepod...
Expressly, this is meant to take place in interstellar space.
Nope, insystem, for the reasons you state: it's a short hop of a few hours at sublight.
If Klingons can deliver Picard and Data to the Romulan homeworld under cloak, surely the Romulans can return the courtesy here?
Now the DSC shuttles suddenly seeming to have Warp 5 capability is a bit of a stretch - the whole point of the Runabouts in DS9 was to be faster than standard shuttles.
...And even their performance was limited to below warp five, as per "Dax".
But the DSC shuttles need not necessarily be starship-fast. It's just that this random movement of characters would then mean the starship herself is making odd detours. Or, alternately, that other starships are bending over backwards to accommodate the transfers. Which may well explain some of Sarek's movements, since he's a VIP warranting the treatment (especially during his odder jumps such as in "War Without"), although not all of them (if he really jumps ship in "Brother", we have to choose between the Scylla of him bailing out at high warp and the Charybdis of him bailing out in a hail of sharp rocks).
Personally, I'd prefer believing in ship rendezvouses, even though DSC visuals are woefully lacking there. When Cornwell arrives in her "cruiser" for "Lethe", no, this is not a fancy name for her shuttle - she just happens to be old school and shuttles over, instead of transporting over. When Number One beams over in "Obol", the ship is right next to Spacedock, allowing Nhan and Reno to also beam over at their leisure before the ship again gets underway. But DSC VFX is cheap (read: expensive and often late), so we fail to see key visuals. Which is nothing new, as TNG also was pure tell-not-show more often than not. Here we just have to do the telling, too...
As for Section 31, there's plenty of time for the organization to fake its death before DS9 rolls along...
Timo Saloniemi