Strength affects various things (not just brute force), and there are various ways to open a door, now just brute force.
From the Wasteland 2 Ranger Field Manual:
Strength is the pure brute power of a Ranger. This does not mean the Ranger is knowledgeable or skilled in applying that brute force, or particularly smart about when to apply it, just that the Ranger has a lot of force to apply. Strength is a natural skill for combat-focused bruisers. Strength influences: Max Carry Weight, Action Points, Melee Critical Hit Damage, Base CON, and bonus CON per level-up.
You could theoretically try to play using only INT characters, but you will find that they are very squishy and are unable to carry much weight. You might also be surprised to see that certain skills do worse than you remember them doing in the past. Because those skills actually rely on certain attributes to an extent.



