It can be slower to lock a deadbolt lock, and requires manual input, which can be overlooked when in a hurry to leave the house. Most external doors have both a deadbolt and a latch bolt lock. Most interior doors don't have any locks at all, with bathrooms as a notable exception. Additionally, deadbolt locks, as well as latch bolt lock, are only as strong as the door jamb. This means that deadbolt locks are less useful on interior doors, as the walls are more likely to be made out of drywall, instead of solid wood, metal, bricks, or stone.

In summary, the main reason deadbolts aren't on every door is the same reason not all doors are locked. The convenience of having a simple door to open and close is more important than security except on exterior doors.
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