Being able to insert a loop cut that keeps the curvature of a mesh is something I consider essential. Sadly this is not in Blender by default, but with these two add-ons you can do it!
Link to the add-ons (you need to install both)
Edge Flow: https://github.com/BenjaminSauder/Edg...
Fast Loop: https://github.com/Jrome90/Fast-Loop
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