Dyson spheres are a nice way to look at what humans are capable of in the future. That is why they probably capture the imagination.
I actually do not see them as much more than beefed up solar panels. 50 Years ago a solar panel was something that most people saw on a novelty pocket calculator. 30 years ago people started thinking about solar panels to actually power a house off-grid. 20 years ago people started things about solar farms that could give useful power to the grid. And now solar panels are ubiquitous and just about anyone can put them on a roof of a house and the world makes them in such large numbers that it is hard to imagine the number of panels made per second.
Maybe in 20 years time we will find out that a solar panel in space is much better because the sunlight does not have to travel through the atmosphere. So why not put large panels in space. Then in 40 years time we understand that we need to position them closely around the sun to get the maximum power output. Of-course the power cord is a bit long to earth so you then also put your factories on those panels. Which is no problem because launching large reusable rockets in space is a problem that is being solved right now. And breaking factories down in container sized chunks to transport them was already invented 60 years ago with containers and container ships.
> Maybe in 20 years time we will find out that a solar panel in space is much better because the sunlight does not have to travel through the atmosphere
It is basically guaranteed that microwave or laser beam from there is going to have a dual use purpose. As a source of energy and as a directed energy weapon. And it is a quite high chance that it will get banned by power which did not build it. Be it China, Russia, EU or USA.
I actually do not see them as much more than beefed up solar panels. 50 Years ago a solar panel was something that most people saw on a novelty pocket calculator. 30 years ago people started thinking about solar panels to actually power a house off-grid. 20 years ago people started things about solar farms that could give useful power to the grid. And now solar panels are ubiquitous and just about anyone can put them on a roof of a house and the world makes them in such large numbers that it is hard to imagine the number of panels made per second.
Maybe in 20 years time we will find out that a solar panel in space is much better because the sunlight does not have to travel through the atmosphere. So why not put large panels in space. Then in 40 years time we understand that we need to position them closely around the sun to get the maximum power output. Of-course the power cord is a bit long to earth so you then also put your factories on those panels. Which is no problem because launching large reusable rockets in space is a problem that is being solved right now. And breaking factories down in container sized chunks to transport them was already invented 60 years ago with containers and container ships.