Firstly, there is a limit to meaningful jobs in the world. We are no longer a society of hunter gathers and with technology it is easier for one person and a machine or computer to replace several people. We could employ many people inefficiently but that will waste resource. After you have fed, watered, clothed, educated and sheltered the masses, there is very little meaningful jobs left. Entertainment?

While I agree that newer smartphones are not more useful than their slightly older versions, you also have to remember that the smartphone has replace an MP3 player, camera, video recorder, scrapbook, notebook and watch.

Moreover, after those smart people have finish creating their useful masterpiece, it is not like they will invent or create another masterpiece in their lifetime. We have more one hit wonders than unstoppable geniuses.

While I agree that billions have been wasted due to hubris. I mean Elon Musk's running of Twitter is proof of that. I also need to add that these mistakes are educational. Some billionaires (or people controlling billions) need more education than others.

I believe that if two blind squirrels and one seeing squirrel have to forage, it is probably more useful for the seeing squirrel to forage for food and get the blind squirrels to sit still and share with their seeing counterpart. It is tempting to suggest that the blind squirrel could offer to be masseur or chefs. But at the end unless the seeing squirrel needs more massages, it is really a case of blind squirrels having to employ each other to kill time.

Lastly, the usefulness of things are just points of view. You could argue that we do need any new writing instruments once we have invented pencils. Fountain pens, ball point pens, gel ink pens can all be substituted with a pencil in an emergency. But think of the advantage when the genius was solving things rather than wasting time sharpening his or her pencil.