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Because somehow or another, BMW owners think their vehicles are different from all others, sure, go ahead and "flush" all you want. It's the lazy man special and shops love it too, no work, and charge $$$.
If you want, you can search (outside your comfort zone) and once you've read enough about the advantage/disadvantage of flushing fluids, you can make your own conclusion rather than try to argue the point when you have little experience.
It has nothing to do with old school or modern transmissions. Lol, they still work the same way, maybe more gears, but work the same way.
But Ok, I'll go there... The disadvantage by forcing fluid through the transmission is pushing particles into channels and places they wouldn't otherwise get with the normal function of the transmission. In addition to circulating fluids in counter direction to normal flow, the transmission filter is left in place, what do you think happens to all the material there? Hmmmm?
Proper method to "CHANGE" transmission fluid is to drop the pan, remove and replace the transmission filter, close pan, refill fluid, drive, bring up to normal temp, recheck fluid, do it again. That takes work, it takes time, and has a higher cost for both the customer and shop. And yes, the "Old School" rule still applies as well, that if you haven't changed the transmission fluid and you're at or over 100k miles, don't bother as there's a high incidence of issues in transmissions shortly thereafter for those who do.
Have fun!
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