The creation of art throughout time has changed significantly with the technology. Dewey, and people in his mind set, see the “old” media of paintings, sculptures, classical music, etc. as high art, and would likely discredit much of the art produced today. The classical mediation between the artist and a painting for example is much different than a digital artist today. The material of a canvas and paint is limited to only so many strokes and redos, and thus what is put on the canvas is planned out more. Similarly, because of economic restraints, an artist does not have as many opportunities to create something. This is especially true of something like sculpture; each hit of the hammer takes away a piece of marble, etc. that can not be re-added.
Modern technologies allow both more mediation and less demand for it. An artist can meticulously plan a piece of architecture or sculpture for months with digital programs. Conversely, much of the art produced today does have an undo button, both literally and figuratively. Anything done with photo editing software can be undone. Alternatively, the proliferation of supplies in modern day and their relative cheapness means that if something goes completely wrong during an artistic piece’s construction, an artist can start anew with much less of a hassle.
This is especially true with music, which Brun discusses in depth. For a large part of the 1900’s recording music had a sense of permanence. Getting something pressed to vinyl was (and still is) incredibly expensive and permanent. Digital music, however, flourishes in its non-permanence. There are multiple takes and remixes of most songs produced digitally. An even more recent example is Kanye West’s most recent album, The Life of Pable. The album itself was released once, only to be taken back and re-arranged several times with different versions and additional songs on the album weeks later. As such, understanding the media is very important to understanding the efforts of mediation. Things can be put out prematurely only to be rereleased later.
Media Theory (Thur) 
I agree with you that everything can be modified with the latest digital tools we have available. If something went wrong, sure we can change that and we can fix it. Though, I believe that whatever goes online and the minute it is published on an online platform, it is there and you can’t do anything about it. Even if you delete your work and re-arrange it, someone has access to the original copy and this might cause some problems.
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Understanding the media is indeed very important in understanding the efforts of mediation. What you are describing is really how art has kept pace with life. As the world has changed through technology, so has art. This is inevitable, because the matter of art is life, without a connection to a live culture, art could not exist. In this way, it isn’t really art that has changed, it is the world in which it exists. The underlying essence of art can be said to remain the same as a concept, while changing in form.
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