well, modern PCs have more beef. Thus they can add ore content like more features,more NPC, grater interactivity, better dialogue, and so forth.
Well, how more interactive could it get? Fallout 1/2 let you pretty much do anything you like with an NPC, steal, talk, sneak around, shoot, etc. I dont see what new "Features" are possible, and as for better dialoge, dialoge is a function of the writer, a beefier PC wont get you better dialoge - The best Dialoge is found in books, no CPU required. What you get is just more recorded auido files - this doesnt make a better game
You missed my point a bit. It's a tech demo, not the final product, there were lots of things that would/could have been improved. And well, people who make games have greater freedom (=more options) to make their games. Like they couldn't have thrown in that huge amount of junk items in VB as in FO 3. Now they can make more animations for NPCs, have greater storage spaces for bigger games, etc.
How would it give you better freedom? Thats not something you need a beefier PC for either... Arena gave you a heck of a lot of freedom and options (too much IMHO, it got confusing to me as to what exactly I should be doing) and required a mere 386. As for junk items, thats just eye candy, it doesnt change the nature of the game itself.