I think it is a mix of both, currently as it stands if you do not plan to engage with FT there is little to no reason to even engage with OC as a whole.
If we compare it to eureka where BA was the capstone you could still have fun and work towards something even if you never plan to set foot in BA. You can work your way through the elemental armors, you can work on your relics, spawn specific NMs for rare gear. BA was basically not needed unless you wanted to have a full +2 Armor set as well as the final stage of the relic (which didn't change its appearance and just gives bonus stats in eureka). And also the support fate for BA itself felt more valuable (actually helping the group inside BA instead of just giving everyone a flat +5 fragments/sanguite) both for the people inside BA and the ones doing it.
I think a lot of people (me included) would be happy if there was something, anything to work for. I like your suggestion of rewarding players for actually spawning CEs. And that way, as you said, it still feels like you're working towards SOMETHING and the progression isn't hard stopped at the +1 gear because you can't get any sanguite. But right now there is little reason to do much of anything in OC if you do not plan to engage with FT.
Hell, if they made sanguite more accessible through other means it would alleviate the need for a "normal" mode FT. While I would still prefer a normal FT that way there's a chance for EVERYONE to grab the +2 armor and work towards something. They already put the aetherspun gold in chests, why not have silver chests have a chance of giving you 1 to 2 sanguite and buff the support fate to like 20 and make it spawn the way you suggested.