After doing some research on my own, i came across some useful and factual explanation that sort of convinced me to do the ATF change.
Here is one such taken from another forum on the same confusion:
www.unofficialbmw.com.
There are also a few more sites that even detail how you could DIY.
"At my last BMWCCA meeting I read an actual letter from the chief engineer for ZF transmissions used in the BMW's.
He said that these trannies were not designed for any type of lifetime fluid- period and recommended the fluid/filter be changed every 60K miles. No exceptions. He mentioned in the letter that he did not know that BMW was using a lifetime fluid and strongly urged them not to do that after discovering this.
My mechanic (BimmerWerks, Harahan LA) is a member of a world wide tech group of BMW mechanics and shop owners. They all agree that the lifetime tranny fluid is BUNK.
This particular ZF engineer is part of that group too.
Note- if you ever have to have your tranny worked on, and the fluid is drained-- the BMW dealer will reuse the fluid!! Yes- pur it right back in! Incredible but true. Only if you insist, will they use new fluid (about 150.00 a bottle- @ 2 per tranny)
Coincidentally, the Lifetime fluid is made right here in nearby New Orleans LA, and shipped to Germany. Our shop looked into buying directly from them, but were unsuccesful.
I love attending the monthly tech session at this shop. They put out great info.
I'm sure if you call the shop I use, they'll explain the matter to you in detail."