It should be hot water topped up with espresso, rather than the other way around.
I like some instant coffees. Nescafe is drinkable, but nothing special. Kenco Millicano is the one we use at home.
Not the same drink as "proper" coffee, but still an enjoyable drink. And we don't have a machine at home. If we are having anything other than instant, it will be filter coffee made in a cafetiere.
You might be right about the americano, but I suspect it makes next to no difference, and the principle is the same; espresso plus hot water. I’ve just recently got a bean to cup machine at home so I might try it.
I’ve tried many of the “full bean” instants, including Millicano. To me they tasted ok for an instant but with annoying sludge at the bottom. The only instant that has ever come close to a reasonable coffee for me is Nescafé Alta Rica. But its still an instant.
It’s all subjective though. I like nice coffee enough to pay a few hundred for a machine and give it counter space and maintain it, but not to the degree of spending thousands on a full barista machine. I like max coffee, minimum faff