Today I played through 16 turns as CW, pretty much hands off, just clicking next phase. Played no cards except mandatory, did not take any replacements (accumulated 17).
The AI air is doing a bit better with stronger attacks, however it is not often coordinating those attacks with land attacks. Still wastes effort almost every turn with one air unit against the Shing Min Redoubt. Air defense phase is generally wasted also - AI positioning its air units in rear areas instead of point of land attack regions.
Jap crossing took place but 5 coastal batteries were not destroyed. There had been around 5 hits on batteries, but not destroyed.
When the Jap AI crossed, it did so with sometimes 1 unit. The AI needs to concentrate before crossing, to land with stronger forces.