Those are all good points! I just wanted to add that a better quality of light (wide even beam, color temperature) does not make a picture better per se. It just makes it easier to get good lighting in the pictures from my experience. My older strobes were much more prone to give hotspots, so I had to move them around more often, correcting the position a bit here, then again and again after that. The better the strobe, the more "forgiving" it is: You just have to spend less time with strobe positioning and post processing. Also for myself I found it hard to get the pictures on the same level with post processing, as just getting the shot right in cam and then process from there. So less correcting in post processing, more improving the image in post processing.
Also it should be noted that as we get more into High-End stuff, the price to performance ratio decreases rapidly. You will end up paying 2 or 3 times a price for getting maybe 10% more. Which might be worth it for some, but not for others.