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Short answer: absolutely not. There is literally no reason to buy a keyboard workstation for anything except live gigging. If you need good sounds then a workstation is the worst possible investment you could make — even the best have vastly inferior soundbanks to what's available on your computer. If you have, say, $2,000 to spend on a music setup, you could spend that on a decent keyboard workstation or on much much better and more flexible sounds that you can run off your laptop and control with a simple MIDI controller keyboard (much cheaper). Don't waste money on a 'full featured' keyboard workstation unless you're gigging or swimming in disposable income that you want to donate to the manufacturer.

There is one thing that I will add to this: The key to developing is knowing what needs to be developed. For me, if I have an idea, I break it down into uniquely recognizable chunks. By developing those interesting and unique chunks, I can develop the whole idea.

You don't count the steps like that. If you don't move at all, you have a unison. If you move a single step, you have a second. The interval is one digit higher than the number of steps the way you are counting them. You'll get used to it eventually though, and won't have to rely on tedious counting. For example, most people would immediately recognize E to E as an octave, as they are the same note.

You have a problem with jazz? .. .. .. .. ;)