Wow. That's taken you a long time to repeat one of your previous points
To get a little pedantic though - it's not the basic premise. The basic premise is that of a group of people on a mission to the sun to save mankind. The heat shield, to which you have taken such exception, is merely a plot device.
I notice you haven't addressed my previous points about this, but I'll expand a little on them anyway. It's fun...
The shield doesn't absorb heat. It reflects it. Now - currently I doubt we could make materials which could act as the perfect reflector (which is what I imagine it would take) - but this film is set 50 years into the future, so it's not against the bounds of possibility. The shield is also not flat - it's a squashed hemisphere, iirc - so it doesn't reflect anything straight back to the sun (I don't know how much difference this would make, but it is related to the points you have made, and it becomes crucial for sections of the plot, as can the fact that the angle of the mirrors can be individually controlled. It has been extremely well thought out by the film makers)
Honestly - I can find a lot of flaws in Sunshine - enjoy it as I did - especially with the whole ending sequence - I'm a little surprised that you're picking on such a small and comparatively insignificant 'flaw' (if that's what it is) in the film, as opposed to, say, the whole touching-the-sun sequence, which looked great, but was a serious 'huh?' moment for me...
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