It's not the materials, its the industry. Inventor and Revit both work with aluminum and stainless steel but have very different applications.
Those are all very different programs. Revit is a structural/architectural BIM design package, but lacks in the high detail nuts-and-bolts level. Tekla is a structural design package, but is expensive and focused on one single field. AutoCAD is a Swiss Army knife, which can do many different things well enough (especially in the field of 2D drawings like schematics), while it supports very diverse customizations with many third-party add-ons it can't quite compete with dedicated products when the latter is all you need to do.
There's also compatibility to consider. If a client is expecting a Revit model, you're not going to build it in AutoCAD. While you could build it in Tekla and transfer to Revit via IFC... why not do it in Revit in the first place?
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If you are going to fly by the seat of your pants, expect friction burns.
"I don't know" is the beginning of knowledge, not the end.