Not worth it unless you knock out a carina challenge at the same time
With the current AI shenanigans, you might end up wasting units on revives n portions if you manage to get in deep into the challenge.
It's your call, but yes i wouldn't do them unless you are doing the Carina's Challenges at the same time, or just trying to 100% everything. I Just did the carina challenges over the last few months, PEAKY D GAMER has some good videos on them released in the last few months as well for the Carina Challenges. Its definitrly conceivable to do each path in under 10-15 revives, but I remember one of the paths (I think Path 4, cause its longer) took like 20-25. Majority of them would be with the boss fight if you aren't used to him or also lacking a unstoppable counter.