That's not really accurate. sHC groups that aim for a first week clear need to:
1) clear the normal mode raid, which takes around 1 hour if you chose to skip all cutscenes;
2) need a few hours to gather/buy things to craft the new gear and meld it (the first pieces of gear appear on the MB a couple of hours after the maintenance is over). This doesn't apply to more HC groups since they usually have their army of crafters and gatherers that do the work for them while they clear the first two turns with the previous BiS;
3) clear and farm the new ex primal for weapons. This takes 1-2 hours. These weapons are pretty much required for a week 1 clear unless your party is god-tier and can get away with crafted pentamelded weapons.
So you see, at the very least it takes several hours of preparations. For sHC groups, this is very vexing, especially if some party members can't take days off work and just want to follow a normal evening raid schedule.
Now, this wouldn't be nearly as bad if at least points 1 and 3 were removed, which is exactly what happens for the first savage tier. Let crafted gear come with savage, but at least let us enjoy the MSQ and the NM raid story instead of forcing us to skip all text if we want to play at a semi-competitive level.