The first problem with microwave beam is that it can be used as a weapon and will be treated as such. So I don't believe it will get over prototype test phase b

The first problem with microwave beam is that it can be used as a weapon and will be treated as such. So I don't believe it will get over prototype test phase before being banned like nukes. Additionally the further you are going to be from such beam, the less energy you will get from it. So transferring any energy from the Sun will be extremely inefficient endeavor. Another big problem with nodes in Dyson swarm is heat, or the inability to get rid of it. They need to be close to the star so they can get as much energy as possible so they will heat up by position, but also modulate this energy and transfer it further, which won't happen without loses. So nodes can be constructed on gigawatt output but in reality be able to do fraction of that, otherwise they would fry itself up.