Using Arabica coffee beans for making instant coffee I saw in this article that instant coffee is usually entirely consisting of Robusta beans. Would making a instant coffee of Arabica beans make a better quality instant coffee? Would the process making instant coffee with Arabica beans be the same?
The process should be quite the same. At least, according to this wholeseller's website.

As far as I understand this company sells 100% Arabica or Robusta OEM instant coffee.

For example, the well-known Nescafe has several brands for different blends. (I cannot reference these as they are based on many years of aggregated information of myself. I cannot even remember when I first hear some of them.)


Nescafe Classic is pure Robusta, but this claim is hidden recently. Still, if you Google it with keywords as "%100 percent robusta Nescafe" you may see old web pages.
Nescafe Gold is a blend, ratios are unknown.
More recent Nescafe Dolce Gusto is 30% Arabica, 70% Robusta. So, I doubt the Arabica ratio of Gold is less than 30%.