In this type of OSR game, combat is a failure state. If your group finds themselves facing an enemy in straightforward combat where all they're doing is pitting their numbers against the enemy's numbers, they've already messed up. The lack of an attack roll is not an oversight, it's a thought-out design decision to emphasize this principle.
If you rush into combat you WILL get hit every time you get attacked. That's a fact players have to deal with by finding ways to manipulate the situation to their advantage to gain the upper hand. There is no miraculous dice roll that's coming to save a player who's about to die, so it's up to the player to create these miracles themselves by engaging with their situation inside the fiction.