You need to go back and look at your example. Your example assumed that by the time you're shooting plasma damage to a target, he is still going to have 15 DT like when you shot him with the 10 damage bullet gun early in the game. It's only logical to assume that as you play through the game, the protective capacity of new armors will increase similarly to the killing power of new weapons. In your example, only the latter exists.
It's almost like you still don't understand! The point was that you can set DT to filter out low level weapons whilst making you vulnerable to high level weapons. In this example, 15 DT achieves that. There is no need to increase the DT above 15, because the goal has been achieved.
15 was not proposed as a low-level DT, it was proposed as a high level DT, under Fallout 3 numbers.
We really haven't gone into much detail here, our discussion has mostly been about whether your bullet/plasma/15DR example proves that DT will cause the player and enemies to take more damage than they would if DR was in effect as it is in Fallout 3. And the only reason that it does is because your example is based on a low DT level contrasted with a high DR level. I don't see how that's convincing at all, or that somehow I am not anolyzing what you're saying correctly when it is your raw data to begin with, not mine.
The reason it does is because my example is based on 'The DT needed to make you immune to low level weapons' contrasted with 'The DR high level armour grants'. Assuming you want high level armour to make you immune to low-level weapons, then 15 would be an appropriate DT for high level armour.
Now, wouldn't you agree with me that by the time you encounter enemies with plasma rifles, your DR is at least going to be double?
...I despair. I really despair. The whole point was that 15 would be an appropriate DT to make you invulnerable to low level weapons but vulnerable to high level ones.
There is no need to double or triple DT vs plasma because DT was set at 15 to be appropriate to filter out low level weapons. You can use DT to make the player not fear low-level weapons whilst being
more at risk from high level weapons than under a DR system. Setting DT to 30 wouldn't achieve that end so it's a manifestly stupid value to choose. In fact, I don't know how you even got the idea 15 DT was supposed to be a low-level DT
given it is more than 50% above the average damage of low-level weapons.
Let's restate the purpose of my example: My example was of how you could set high-level DT such that low-level weapons did less damage than with high-level FO3 DR values, and high-level weapons did more damage than with high-level FO3 DR values.
No low-level DT included. No NV values included.