First of all, calling that curve "Faulty" is misleading to "yourself". That curve is exactly what you drew.

It does "NOT" do a proper loft with "ANY" of those curves. You'll notice if you try to loft it with that curve it just creates a "Surface". That surface is not a joined solid but has overlapping edges that are really of no value for what you are trying to do. You need to look at the results closer and what the application has already told you.

I would suspect that such a casual user would just expect that unintended results that he creates would be normal. Anybody wanting to use an application properly has to put the time in to learn how to do so.

Becoming involved with an application in it's creation state requires responsibility on the users part. If one doesnt have the time or energy to put into using an application, then that person should be aware that unintended results will be the "norm" for him.