You missed my point.
Being inefficient is fine.
Using resources to do so is fine.

But the effect should give a comparable result in return. Either firing at you or having to jump through hoops just so it accomplishes basic functions is not comparable to the drain on resources (including the requirements to set it up in the first place).

Saying it can't be good or usable because then people would use it is an absurd statement. Especially considering the popular alternative to defense right now is creating indestructible walls made out of dirt.