Doesn't anyone care about the story anymore?
Well, of course we do. But it is also true that players tend to be frustrated when their PCs are handicapped because of "DM's story". Especially when his PC becomes almost useless when others don't.
I don't say we should not use such a situation in an adventure. But IMHO it is also true that as DMs, we should know better how such a situation affects on various PCs, to make a game an enjoyable one.
As I said before it's only a temporary situation, and it's either one you're in at the start of a campaign or worse you FAILED earlier and were captured. Man gamers these days want everything on a silver platter.
Yep. Such a change of pace works from time to time. But that is a big gamble for a DM. Your players may just enjoy the situation, or get frustrated. You need very careful manipulation.
IMHO, it will be safe to make it REALLY temporary or many players start to get frustrated than to enjoy the game.
Also, stripping down all the gears and giving replacements may displease some players. Sometimes, not just their character's own abilities, but also some gears are the part of the "history" of that character. Say, a fighter has his signature longsword, which is a legacy from his lost lover, upgrading it's property as he levels up instead of buying a new one or replacing to a new found treasure. Removing this sword from the fighter and just giving "replacement" will cause a big effect. Of course, a creative DM can make it a chance for a new interesting story arch.
As I said before, it's only a temporary situation, so really who cares if one player shines brightly than another. In my experience, different character classes shine in different situations and in my books that's okay.
IMHO, partially true, but partially not.
Different character classes shine in different situations, was quite natural in older RPGs.
But 4e is a game system which trying to lesson the situations when "some PC shines but others have nothing to do."
Now, unlike pre-3e editions, and more than 3.Xe D&D, all the PCs can shine in both combat and non-combat encounters. Rogue class used to be a skill monkey but not always useful in combat. In 4e, on the other hand, sneak attack is always useful. At the same time, most skill challenges, at least well-made ones, are either incorporated in a combat encounter or allows almost all the PCs to contribute somehow.
Thus, "different character classes shine in different situations" is somewhat rare in 4e gaming experience. So, if a DM is trying to make such a situation intentionally, he should determine well how that will affect the gaming experiences of each players.
Finally, if, a DM have confidence to let all the players enjoy the game, even with all of those effects, he should do it. It may make a great game.