I think it would be awesome to have these two modes to chose from.
Battlegrounds if my favourite PVP mode cause it's the most "plug and play" compared to IC/Cyrodil. Cyrodil is ofc the most fun when it works and you find people.
Battlegrounds is kinda weird cause it's Proc but no cp. I would love to try No-Proc Battlegrounds/CP Battlegrounds as the title says.
What gw2 does is simple but thats what allows it to be competitive. No sets, no gear, just stats and ur weapons/skills. The eso equivalent could be just CP and crafted sets, or how about they activate cp and add in a small amount of bg specific sets. Anything would be better than what it is. Plus gw2 has reward tracks, ranks, events, and is just all around a lot better and more competitive.
But sadly zos take forever to change anything bad into something good, and i dont think they care much about pvp, but thats just my opinion.
I've mentioned this a few times in the forums, pre-made sets that are actually balanced so you can kill, heal or tank. Of course they will struggle to balance them at first but that I am happy to help with.
It would however get rid of any doubt about skill in bgs and give us a competitive element to this game which so many players are yearning for.