JP lacks synergy as their are non doctrine snares in the okw army making it more difficult to use.
JP lacks synergy?
Its long range medium tank destroyer that can be surrounded by best AT infantry in game.
That means it can dish out punishment, take some and is protected by AT that actually KILLS tanks as well as(like all axis players like to say about sov) cheap mines that can be placed on flanks.
Ineffective allied handheld AT only enhances its strength as it needs to be attacked by vehicle to be countered.
If that is not synergy, then I don't know what is.