So you subjectively assume that Featherine think it will be more entertaining and deny what her opponent which has some tier of in-verse knowledge state about her? In that case it's you talking as oppose to the panel shown.
No, I am speaking from my knowledge about the verse.
"Featherine Augustus Aurora" is a role that is being played by a character. She also plays a role as an ordinary human author.
Featherine's Witch form is just a role to her.
In general, for all Voyager Witches, their avatars are just physical manifestations.
Consider this part of the lore of the verse.
And also she needs help to alleviate her boredom? Boredom is a fatal illness to an all-powerful figure? Regain consciousness so they had a period in which they dont have consciousness, so an existence permeating all realms and possibilities have a moment of having no control over themselves? Still seems like the same case as Marvel and DC's over-the-top omnipotence dominance over plot coherence to me.
She's not supposed to be omnipotent in the world of Umineko. She's just the most powerful of the Witches.
Yes, the all powerful Witches can in fact lose their identity.
If they stop thinking, they stop existing. Their "identity" ceases to be.
Consider the power/title/concept/law the Witch embodies to be different from the identity/personality that embodies that concept. When the Witch "dies", the consciousness ceases to be, but the concept they embody still exists, so they are never truly dead. If they start thinking again, they regain that consciousness.
What dies is their consciousness/personality.
Perhaps their "death" to boredom is simply that they stop thinking and so cease to be conscious.
Anyway, the entire setup of the When They Cry verse is these uber powerful Witches entertaining themselves and one another through stories and worlds they create. It's not about crazy powerscaling. The crazy powerscaling comes from the complexity of the stories and worlds they create, and the entire cosmology supporting it. Yeah, there is a crazy powerscale, but it's really secondary or tertiary to the entire story. Unlike DC/Marvel, the crazy powerscaling is just a backdrop of the story and not the point.
Think of how in the Cthulhu Mythos, the Outer Gods are only so powerful as a setting element to tell a tale of existential horror. There isn't a Shounen type campaign to defeat all the Outer Gods or anything similar. Umineko is like that.
Fundamentally, the plot of Umineko is about one such story created by a Witch for her entertainment. Umineko isn't about powerscaling. Power levels and the like are very fickle, and characters power levels fluctuate a lot, in part because some characters are confined to a role or a piece on the gameboard of a Witch, or a character becomes a Witch, or a character is a role being played by another character, etc.