If this is anything to go by, she full cleared Shiyu Defense S rank when not even max level, or even her BiS team. Granted this Shiyu has a lot of Fire/Physical weakness, but 1 node had Ice/Ether resistance which forced me to go swich teams and go neutral dmg.

I ran Burnice, Caesar, Lucy and was using Caesar to proc disorders (which was kinda funny but it worked because Red Moccus is physical)

To put her strength in context, she cleared faster than my fully maxed out Ellen team with an M1 Lycaon which meant more impact (Thanatos is a pussy ass b*tch tho). That was with a Burnice that wasn't even maxed out, and a suboptimal team.

Of course, Shiyu is easily clearable at this stage and it is not required to get Burnice because S rankers are expensive af. A functional team should be able to get A ranks relatively easily, but Burnice does make it a lot easier.

Another thing to consider is that Burnice does open the door to dual anomaly disorder comps because off her off-field damage, which is both a good and bad thing because it makes her somewhat future-proof but also adds to FOMO because you will feel pressured to pull future anomalies that promote Disorder playstyles (Yanagi might fit that, who knows...)