I agree, over all it's a bit unrealistic, especially when it comes down to really small dinos breaking through electrified concrete. But actually it has an impact which kind of fence you build and a
huge impact how you breed a specific dinosaur.
I did some research with Deinonychus, for example:
Deinonychus, maxed lifespan genome -> attack value 42
- light steel: damaged: 2 hits, breakthrough: 4 hits, behavior: all attacks in one spot, in a row
- electrified light steel: damaged: 4 hits, breakthrough: 8 hits, behavior: one spot, 1-2x hits, walks away, attacks same spot again
- heavy steel: damaged: 4 hits, breakthrough: 8 hits, behavior: one spot, in a row
- electrified heavy steel: damaged: 7 hits, breakthrough: 13 hits, behavior: one spot, 1-2x hits, walks away, attacks same spot again
- concrete: damaged: 10 hits, breakthrough: 20 hits, behavior: all attacks in one spot in a row
- electrified concrete: damaged: 17 hits, breakthrough: 37 hits, behavior: 1-2x attacks in one spot, walks to another spot, 1-2x attacks , walks to another spot, ... , returns to first spot - it takes forever

- Deinonychus, maxed attack value genome -> attack value 158
- light steel: breakthrough: 1 hit
- electrified light steel: damaged: 1 hit, breakthrough: 2 hits, behavior: one spot, in a row
- heavy steel: damaged: 1 hit, breakthrough: 2 hits, behavior: one spot, in a row
- electrified heavy steel: damaged: 3 hits, breakthrough: 4 hits, behavior: one spot, 1-2x hits, walks away, attacks same spot again
- concrete: damaged: 4 hits, breakthrough: 5 hits, behavior: one spot, in a row
- electrified concrete: damaged: 5 hits, breakthrough: 7 hits, behavior: one spot, 1-2x hits, walks away, attacks same spot again
Electrification reduces the damage from attacks and the attacking dinosaur walks away, gives you more time to react. Except you breed hyper aggressive dinosaur, they will kick... [big grin]
Interestingly enough, none difference between electrified light steel and heavy steel fences.