for the most part BWs have articulation but not always in alt mode
People complain about articulation in G1 where alt mode has articulation but their bot mode hasnt. In Bws their bot modes were articulated at the cost of their alt modes. rhinoc k-9 wolffang anklesarous cant turn heads or legs.

so as u can see articulation didnt come completly until best machines. though i have never bought a bm toy so im assuming it was that line. otherwise unicron trilogoy?

note: not concerned with G2