Shouldn't there be more difference between "hard" and "soft" targets to make the differences with these new bomb types more practical?
That's what I thought too. I hoped for a more, excuse the term, "realistic" modeling of AP bombs, giving them a true armor penetration value, depending on their size and impact speed (mostly depending on altitude). Against a hard target like the SB the standard GP bombs (as well as HE rockets) would do almost nothing, while AP and SAP bombs could penentrate and apply their explosive damage to the full extend. Just like shells in tank combat do.
On cruisers (and even more on possible future battleships), HE bombs could do heavy damage vs none or only lightly armored structures on deck (guns), while AP bombs would be better suited to actually
sink the ship. We could also expand that concept to ammo bunkers on fields, requiring SAP or AP hits (or very large HE bombs) to be destroyed. More targets like that could be added in the future.
Then we would end up with a multitude of different targets, where plannign your mission ahead, chosing the right loadout would really matter, instead of just grabbing the biggest load your plane can carry.
Some numbers:
CV planes that now can carry AP bombs and the resulting increased lbs dmg equivalent:
B5N (bomb) 2165
D3A 927
SBD 1968
In comparison, carrying the good old GP loadout:
F4U-D 3248
And against area targets like the town, the increased damage of AP bombs is more than just countered by the reduction of the blast radius to only 20%.