I carry a snub revolver more often than anything else, so I see no issues with the Shields's capacity for carry, but home defense is very different from my perspective.

As a civiian, in a public/concealed carry defense scenario, complete avoidance is the primary goal followed by escaping the conflict. I think a 5 round J-frame or a single stack auto like then Shield is sufficient for this role.

In a home defense scenario, I can't readily avoid the confrontation and escape is not often a practical option, especially for those of us with children. I will have to make a stand and in that context, I want all the capacity I can get. I have come across far too many home invasion cases involving multiple intruders to be comfortable with relying solely on a revolver or single stack auto. More often than not, the intruders flee once the shooting starts, but I don't think it wise to count on that occurring and choose to prepare for the possibility of multiple determined intruders who still engage even when confronted with armed resistance.

YMMV