I disagree - Beast Machines did try to blend itself into G1 and enhance G1 just as Beast Wars did. Arguably it wasn't executed as well, but they did make a similar attempt. For example:

+ Sparks, the AllSpark Matrix - again, continues on from canon established in Beast Wars which itself harks back to G1/G2. In Beast Machines we see Sparks making a journey back to the Matrix, which we also saw in G1 when Transformers ventured into the Matrix. Beast Machines establishes that all Sparks are destined to return to the Matrix, which harks back to Optimus Prime's famous words, "Till All Are One."
+ Technorganism: In the G1 episode "Dweller in the Depths" Cybertron is shown as having a technorganic core and the ancient inhabitants of Cybertron (creations of the Quintessons) being technorganic in nature. The G1 comics also showed an ancient race of "technorganic" looking creatures who also dwelled in the depths of Cybertron who surfaced when Cybertron was being "reborn" - they killed Battletrap and Runabout and got trounced by the Dinobots (the fight was Grimlock's first as a true Action Master).
+ The Oracle - who was later revealed to be a remanifestation of Vector Sigma - who in turn has been retconned as an "embodiment of Primus."