IMHO May I suggest: Horses for courses.
The lack of calendar integration & reminders recognises that very few things stay still (so #now & #soon are all that’s needed), & enables focus on the work in hand. (I presume it also keeps the application fast – which is a big plus point.)
Definite events should be in the diary, not in workflowy. The prep & follow-up actions to a meeting will be in workflowy. This is in line with GTD.
If I wanted to use a diary view of my work then I’d use a diary & move tasks around using that interface, not try to squeeze it into workflowy.