historically Town gates where locked up, to keep people in and people out. It is also why inns that were sitituated outside of the town, were the towns for the poor, the travellers and the like. Pilgrimas often stayed at these types of inns to get a head start on their pilgrimage.
Also this would help with immersion, as one of Barovia's Big themes is isolation. It is an isolated country, a xenophobic place, which lock their homes and are even said not to go out at night to save their children.
However, this would also hurt places such as the following. Each of these places are in vallaki, which I would like to see more people using. *nods*
- Tigen's rest
- Broken Bell Inn
- Blue water inn
- the morninglordian church in the slums
- The fishing place in the docks
- The ezrite church and rectory