I think you're making huge assumptions on very little information. Yes, using Strength to force open a door may still be a challenge if they don't have anyone well-invested in strength. That's pretty much all they're saying yet you're jumping to the conclusion that there will be no other way to force open a door in the final game.
You need to chill out a bit. Pace yourself. There's a long way to go before this is all done.
Using strength to open a door is obsolete at level 20. The example is stupid, and hopefully a mistake.