It really depends on what your design intent is. Inventor is primarily an application for precision modeling of machine parts, history-based and totally parametric. The Freeform tools allow creation within Inventor of much more organic shapes, but at the price of precision and parametric history. If your intent is to produce an interesting look and feel, more art and less machining, as one or two components within an Inventor assembly, then Freeform is the right tool. This is probably most useful for 3D printing or other additive manufacturing technology. But if that's what your whole project is about, then Inventor is not the right software at all.
For a new Inventor user, forget all about Freeform until you've learned the core of Inventor pretty thoroughly. I find Freeform interesting, but have never used it for anything that mattered (such as actual work).
BTW, the example I posted was not a "revolved spline"-- no splines involved. The profile sketch is composed of three arcs and a line. The advantage of a parametric history-based modeler such as Inventor is that you can examine every aspect of its creation and adjust as you wish. In this case, you can edit the sketch and find out how it is put together and constrained, and you can adjust parameters (such as dimensions) right there to change the model in a carefully controlled and predictable way. Give it a try!
Sam B
Inventor Pro 2021.2.2 | Windows 10 Home 2004
LinkedIn

Sam B
Inventor Pro 2021.2.2 | Windows 10 Home 2004
LinkedIn
