Kevin's Presets show what Dune 3 can do not what it must do.
You can take D3 all the way down to a single Voice (Layer) with a single Osc and go from there. It can be the simplest synth in the world but it can also do very complex sounds for those of us who got bored with simple sounds many years ago.
Sure you could take one of Kevin's patches, add a drum track and have a nearly complete song or you could shut the Arps off in that patch and use your own sequence data.
Anybody who refuses to use any presets made by someone else is simply missing out on musical inspiration and failing to take advantage of other people's skills and talents. I have nothing but pity for them.
I love making my own patches but I'll use another person's patch in a heartbeat if I find it musically inspiring. This snobbery that we have to do everything ourselves is ridiculous in my opinion. But that's the difference between musicians and "producers". Musicians know that inspiration can come from others since they have been in what were called "Bands" where several musicians freely exchanged ideas and inspiration.