If we mention it in Al Hanisim, and commemorate 8 days according to one opinion to remember the nes of winning, why do you think we are ignoring it?
If you are asking why we may stress the nes of the oil more than the nes of the battle, maybe it’s because the former was a spiritual nes and the latter a physical one, and we are stressing that unlike the yevanim, the spiritual realm is far more important.
Another possibility- the non-frum tend to make a big deal about the Maccabim as a symbol of Jewish strength and independence. Focusing more on the nes that cannot be wrongly attributed to kochi v’utzom yadi indicates that we believe also that the nes of the battle was from Hashem.
