Yes, parametric is awesome

but

What you describe isn't what defines parametric software. A truly parametric methodology involves inter-design dependencies. You will only really get into that when you start a top-down approach that relies on article/product parameters that govern and control subsequent stage stages.

In a nutshell, you design a product. This can be a single item or an assembly. This governs all down-stream parts and assemblies required for manufacture, testing, etc. Change the product and all down-stream parts will adjust accordingly, including drawing and other documentation.