Ford demands worse oil than BMW ?!

Have found the following statement from Sterndocktor in the BMW Forum: “(…) The 0W-30 mobile 1 but is a special Ford oil with ACEA A1/B1/A5/B5 profile. May therefore be used in NO BMW engine (the 0W-30s with BMW release are however such with ACEA A3/B3 profile)! (…)” Does this mean that Ford is less demanding than BMW? Why? Is the engine “rustic”? 😉 Should I not be allowed to do something good for my Mondeo TDCI and indulge in a better oil? Or are in oils (5W-30) nac h the Ford specification contains specially tuned additives for the TDCI Common Rail engines that are not in other oils? Note also the case here in the forum with the “broken ST220”!