Isn't that because there's only a handful of people (comparatively) who own Takara/TakaraTomy Transformers while there's far people people who own Hasbro Transformers?
Logically, with the more Hasbro toys there are in the western english-speaking fandom, the more faults and quality control issues will be found. And unfortunately, there is the stereotyped perception that "everything from Japan is better".
Funnily enough, the official Binaltech book, The Transformers Binaltech & TF Collection Complete Guide, stated that Japanese fans often go after the Hasbro versions of Alternators because they could be played with without fear of damage or chipping.