Currently japan doesnt have a single good dedicated bomber/ heavy fighter bomber for the attacker slot.
The B5N2 has only a single drop and not even a gun.
The D3A1 is just an early JU 87 but nothing that special or exiting.
The DAY1 isnt even that good for BR 4 as it struggles to climb and doesnt feel any faster than any other 500kg bomb payload plane. It moves like a brick and the cockpit doesnt help you eighter.
There isnt anything it can do if anothere fighter(or bomber for that matter) shows up expect hope to somehow survive long enough to drop before beeing shot down.
Japan already is very reliant on their fighter slot to bomb the enemy while the bomber slot is vacant for a good amount of the game.
Japan already has great figter and im sure the new one will be great too (even if the dual 60kg at BR 5 is a bit odd) but what japan was lacking for BR 5 wasnt 2 new fighters but a bomber that doesnt need as much baby sitting and can pack a punch against ground targets at the same time.
I did some minimal digging in WT and regarding the payload I found 2 common options for bombers.
Here the Ki-49.
- 4 250kg bombs
or - around 12 of 50/60kg bombs
im not yet sure if a 250 kg bombs or a more unique 10 or more 50(or 60kg) bomb payload would be a better fit. The dual drop of 250kg bombs would be the safe option as it would easiely deal with tanks and is already proven to work but the 50kg/60kg option would be interessting aswell for the abitly to carpet bomb an entire area while sacrificing the lager bombs that would be better agains tanks.
But I do understand that even small bombs can be used to devastating effect so it might be a bit more risky to implement as it isnt as explored as othere payloads so far.
Im sure there are people willing to share othere suitable candidates to fill that slot in the comments so feel free to post planes that you would like to see.