Subverting the old joke, this character really was born yesterday, or this week at least, either artificially aged or just plain made the age they are now. This trope is basically about unbalanced relationships and male insecurity Why is it still being written?
The “born sexy yesterday” trope sends a clear message It's related to the 'born sexy yesterday' trope, which is still around (and tvt doesn't have a page for either.) If even the most brilliant, powerful woman can lower her standards, abandon her origins, and submit to the guidance of a man, then so.
This trope has been around for decades, but only recently has it started to be consciously understood. Perhaps the most poignant thing they have to say about born sexy yesterday is that, in practice, it just doesn’t work In line with the trope, bella is created so that she can be easy to control and impress, while also being imbued with sexuality on account of her adult body. These are jokes, of course, but no one would get the joke if it wasn't referencing a real thing