No. Every campaign in I've run since 5e came out has been very sandboxy. How many encounters they have per day is largely up to the players. If they don't do the prep work and gather intel, they may find them selves struggling to survive escaping from far more than the recommended enounters. Or they may be surprised by a tough encounter, but have an exit to rest strategy, risking that they may have lost some progress do to the enemy bringing in reinforcements and being more prepared for the party when they return. They have to weight the consequences. Do we risk another couple of fights or do we risk leaving and having a tougher time of it when we return.
It makes the sessions swing pretty wildly between cake walks and OMG HOW CAN WE SURVIVE THIS!
If find that this approach works much better with experienced players. Newer players, or players that are used to more linear storylines designed to progress through a series of level-appropriate challenges, can easily find themselves in a TPK situation. But it works for us.