I think the other reason behind the forced participation is that every character should have some ability in the different areas. If the party needs to scale a cliff to get to the big fight, it isn't a good idea for one character to have an 8 strength and not train in atheletics. I see it as a way to keep someone from completely dumping a certain subset of skills. The good piece is that you usually have some leeway as to which skill you're going to use. It doesn't have to be diplomacy, as you can use bluff or intimidate, or one of the knowledge skills. That way you can play to your own strengths.
I saw it as more of a way to make the skills actually mean something without making a series of encounters that exclude half or more of the party. I know in Red Hand of Doom, there were moments where my 'face' fighter did most of the work, with a little help from our cleric, while the antisocial rogue and wizard hung back and did nothing. That's a lot of pressure to put on a couple of party members, and not a lot of fun for the rest.
I will do my best to be flexible, but I think the other half is that the days of the "I have no social skills" barbarian or fighter are gone, as are the "I can't climb the stairs" wizard. Everyone needs to be able to do something useful in every situation, and with the flexibility of the skill challenge, everyone should be able to do so.
I saw it as more of a way to make the skills actually mean something without making a series of encounters that exclude half or more of the party. I know in Red Hand of Doom, there were moments where my 'face' fighter did most of the work, with a little help from our cleric, while the antisocial rogue and wizard hung back and did nothing. That's a lot of pressure to put on a couple of party members, and not a lot of fun for the rest.
I will do my best to be flexible, but I think the other half is that the days of the "I have no social skills" barbarian or fighter are gone, as are the "I can't climb the stairs" wizard. Everyone needs to be able to do something useful in every situation, and with the flexibility of the skill challenge, everyone should be able to do so.