Yeah, it's an irony. But it's because computer AI sucks.
RPG's mostly owe their existence to their pen & paper predecessors (the most famous of which is of course D&D)
But... The computer is essentially being asked to take over the role of game master here.
And while it can do some things really well, one thing computers have a really hard time with (and humans not so much), is improvising.
This is especially true of conversations.
Consider this:
You walk into a tavern, and go up to the barkeeper.
The scenario is designed so that you can ask him about the problems at the castle, order a beer, or ask if there's anything interesting going on in town.
in a computer RPG, that's all you'll ever be able to do, because that's all that was planned for.
In the pen & paper scenario,
That's all the DM/GM planned for. But, since they are quite capable of improvising,
You can ask the barkeep what the weather's like.
Does he know any good shoe shops?
Would he like to marry you?
You could try to cut his head off, and see what happens...
Steal food.
Break a table.
Smash the walls...
Ask if he has any grapes.
Or if he plays golf.
Point is, even though the DM probably didn't plan for most of these (though if the DM had any sense he or she would have thought about at least a few of the more obvious strange things a player might try.), because they are more than capable of making stuff up on the spot, they can find some way of answering any question, or dealing with any situation,
no matter how unexpected, bizarre or depraved the player's actions might be.
For a computer game?
Not so much.
A particularly thorough developer might have considered a stunningly vast array of possible player actions, and created appropriate content for all of it.
But you are still limited entirely to what the developers thought of in advance. You pretty much are incapable of doing anything they didn't expect, because for you to be able to attempt it, they would have had to predict you might try it to begin with.
This could change eventually, but there'd have to be some serious improvements in how a computer can intelligently adapt to unexpected situations.