Unity toon shader causing object flickering

Is Unity Toon Shader future proof / Can I use it in my commercial game?

I wrote a tutorial for toon/cel shading (link/source in comments)

Learn To Use Shader Graph To Create Awesome Effects In Unity

Your Ultimate Guide to Shader Graph for Beginners

How to shape this shader more like a triangle than a circle ?

Unity Toon Water Shader Tutorial at Roystan