I turned Warp Relays off, very soon after they were introduced, after spending several minutes scouring a neutered planet to find the 5 cloaked Zenith Reprocessors which were threat, which were not attacking my fleet parked on the planet, and which were maintaining the Warp Relay at 91% complete. Reminded me of the bad old days of cloaking guard posts + Eyes, but at least you only had to do that once per system, and the cloaking posts didn't move. Then shortly after I found & killed the reprocessors & left the planet, a new relay started construction on the same planet.
I like the concept of the relays, but repeatedly clearing tiny amounts of threat (including cloaked threat) off every planet adjacent to mine was just frustrating.
FWIW, I leave Counter Attack Posts on.