I personally think the OPs reason to use etcd is mainly about 2 parts:
1.) The ecosystem it integrates in
2.) Only maintaining 1 SR technology
I think that with the upcoming kubernetes trend, many OPs guys are somehow familiar with the CoreOS stack where etcd fits in very great. The hashicorp toolchain is great, but I've seen many OPs guys only using terraform or vault e.g. and don't build an integrated environment with nomad or atlas.
The CoreOS stacks I've seen are more integrated in platforms than the hashicorp ones (can be a good and a bad thing at once).
I think that with the upcoming kubernetes trend, many OPs guys are somehow familiar with the CoreOS stack where etcd fits in very great. The hashicorp toolchain is great, but I've seen many OPs guys only using terraform or vault e.g. and don't build an integrated environment with nomad or atlas.
The CoreOS stacks I've seen are more integrated in platforms than the hashicorp ones (can be a good and a bad thing at once).