> may be we can attribute the loss of aesthetics to the financial gain it brings.That's an element, but another big element is specialist-subject education.
If you are an old-money guy, you can spend your life figuring out the best attributes of everything around you, and pursuing excellence in what you own. Your parents and grandparents can educate you in what a great staircase looks like, and you can spend weeks going from shop to shop until you find the right thing, or hire a carpenter to make it for however long it takes to be "just so".
If you are somebody who's just made their money, and maybe are still neck-deep into the rat race, you don't know anything about staircases and you have no time, nor contacts, to educate yourself on what it should look like. Developer shows you the staircase, it looks alright, sold.
More and more people are chained to their day job for longer and longer. More and more people are coming up in the world and buying stuff they don't know anything about, enriching companies targeting the mass-market more than specialist ones. This is nothing new: in the XX century we've seen this happening for anything from clothes to cutlery. In a way, it's a good thing: objects become more and more efficient and functional, eschewing aesthetic values that are somewhat irrational and often just classist. It's true, though, that we lose a cultural element.