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That vtubers avatars are designed is a major differentiating factor from a regular facecam streamer. Having an interesting or visual appealing design SHOULD probably be a major factor for the viewer, but can be ignored or overcome via factors like the streamer's personality or content. You can't, however, overcome bad personality/content with just a bangin' avatar....unless you're just a fuckboi.
Just going by my own preferences, and what other people generally seem to talk about, people are more likely to pick up a chuuba for their model, and more likely to drop a chuuba for how they act.