Why didn't the Separatists use Hunter droids in the Clone Wars?

[Dorian Breh]

Why did they use those useless "Roger, roger" droids instead? shyt would've been a wrap for the Republic if they had

 

[Sterling Archer]

Didn't know Instagram was still a thing by then.

 

[Dorian Breh]

Didn't know Instagram was still a thing by then.

Nah, B, the hunter droid from The Mandalorian that wiped out Moff Gideon's whole crew dolo. Why didn't they make em like that for the Separatist army??? Would've been a bloodbath.

 

[Rell Lauren]

More expensive to produce. They had infiltrator units and specialized droids, but given that they were also in debt to the Banking clan, would they waste their finite resources on a smaller group of droids that wouldn't necessarily turn the tide of the war?