For the Anycubic Kobra 3 support, we already have multiple profiles developed for several different setups. Email your setup details to the team using the link below and they can help you with the correct profile: https://www.simplify3d.com/contact-us/
While dynamic line width that adjusts intelligently according to feature sizes would be an interesting idea, I believe First Layer Width can already be used in this case to have a different line width than the rest of the layers.