"rogue's powers weren't the source of magneto's revolution, they were the key. big difference. he needed her powers to operate his machine."
But still it'a an unrealistic and bad scientific theory. Absorbing powers being the key to operate a machine is nothing but make-believe.
"it would be difficult for magneto to hold kitty captive as a hostage if she could just phase through anything he locked her in. if kitty were tied to magneto's machine, she'd simply phase out of the locks."
Well I'm sure they would've had Magneto use something like a machine or his powers that would stop Kitty from using her phasing powers to get out of whatever she had been locked in. Now to answere the rest of your questions...
"what if wolverine had stabbed kitty through the chest? could kitty heal herself like rogue did?"
She would've had to react quickly and phase through the claws. That would've had audiences thinking, "Oh no what if she didn't phase through it in time?" That's if they were gonna have her go to him like that though.
"if kitty were trapped in wolverine's burning truck, she would have just passed through the seatbelt to safety."
Well this would've still been at the point where Kitty's powers had just manifested. If she had been trapped it would've been b/c she didn't have complete control of it or she wouldn't have understood yet how her powers work.
"rogue's role was very important in the first movie."
I don't care. I still think there would've been a way to make Kitty's role important in the first movie. Not just for being a scared girl looking for acceptance b/c of what she became, but also some kind of a plot device for Magneto.
"if you want to take her out and put kitty in, you're asking for an entirely different movie."
How can you be so sure it would've been an entirely different movie? I don't recall the filmmakers saying it would've been very different if Kitty had been the one.
"i've got my issues with x1, but it is still a good movie. if you don't like it and you refuse to change your mind about it, fine, that's your opinion and i respect it."
Fine but good movie does not rule out character and story screw ups.
"but x1 worked for the most part as it was, with rogue, not kitty. if the writers thought kitty would make the movie work, they would have put her in it.
What law said X1 had to be the way it was anyway? None obviously. It was nothing but imaginations from a gay and stubbern guy who didn't do his homework here and didn't care about anybody but his favorite characters. That's why I say Bryan Stinker just made these movies for himself. The writers (Tom De Santo and David Hayter I think) thought it was gonna work with Kitty Pryde until Bryan Stinker showed up.