Superstrings, multiple dimensions and multiple universes are not standard physics. They are highly speculative and frowned upon by many serious scientists. The evidence for dark matter is overwhelming, dark energy is merely the missing energy which is needed to explain the shape of our universe. You cannot have a functioning computer without quantum mechanics being correct: semi-conductor based transistors are wholly linked to quantum physics.
Literature doesn't produce practical technology either, since the beginning of time in fact. Does that make it worthless? As for the rest of your allegations: you are wrong, and what can be asserted without evidence can so be denied.
You might as well deny that gravity exists. Not that I expect any of this to get through to you.
It was several years ago, but i read a book called the The Big Bang Never Happened.. by a physicist and contrarian aimed at a general readership.. which made a pretty powerful case against a lot of the Cosmological structural beams.. which have become ever more complex and bizarre as gaps appear in its pristine simplicity. In fact, some were discarded completely, allowing for 'inflation' and all kinds of unseen elements.. without ever going back and questioning the original premises.
The author was looking for other explanations like Hans Alfvens proposals of a filamentary universe. Not being a scientist.. or in anyway science oriented myself.. i still see huge problems when theories are floated the can NEVER be proven.. such a multiple dimensions and universes.. or such concepts as 'uncertainty' or 'progression' of time. Those things really do move into the realm of philosophy.. and i would propose.. fantasy. Certainly if the Big Bang never happened.. then the scientific framework of Dark Matter and related theories collapses.
The overriding characteristic of modern physics is it is based on mathematical speculation, not observable phenomenon.
And i'm not sure Quantum Mechanics is responsible for the computer.. it seems to me practical experimental electronics (not to mention chemistry and metallurgy).. has had a separate development from Physics.. since the latter half of the 20th Century.