The faction Shield Power Relay isn’t good enough compared to T1 modules.
Caldari Navy Shield Power Relay gives a -26% recharge rate bonus compared to i.e. -22% from a Type-D Restrained Shield Power Relay.
On the other hand the capacitor recharge rate penalty (which is called a bonus in the attribute making it confusing) is -30% for the faction module compared to a -20% only for the Type-D, meaning that the T1 module has 10% less cap recharge penalty for only 4% less shield recharge compared to the faction module.
Basically, unless you hardly need your capacitor at all, the Type-D t1 module gives overall better stats than the faction one.
CCP please improve the faction module, as it is it’s not good enough.