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)

Milad Kambari

Learn To Use Shader Graph To Create Awesome Effects In Unity

Introduction to Scripting Shaders in Unity

Unity Toon Water Shader Tutorial at Roystan

ゼルダの伝説 ブレス オブ ザ ワイルド風 Toon Shader のチュートリアル - 強火で進め

Making A Stylized Toon Shadering Within Unity