There are a few problems with just laying cable everywhere. Outside of developed urban areas the costs of doing this, and maintaining this, exponentially increases with remoteness.
Imagine you live in a small community out in the Canadian Rockies, or in the desert, or Himalayas, Siberia a small island community, no company is going to lay fibre cable all the way out to those communities if there are only a few people to pay for it. They would never recoup their costs.
Plus you have ships, oil rigs, airplanes, expeditions to remote areas who may need fast internet connections for navigation, communication.
Imagine if Malaysia Airlines Flight 370 had a permanent connection to a set of orbital internet, people would have known exactly when it went off the grid, heck they could have even streamed flight data to its company or local ATC’s.
I think buggering up the night sky slightly to get all the benefits of cheap global internet connectivity to help this remote communities to develop and have access to the world is worth it. We just need to put some more telescopes in space. A telescope on the darkside of the moon would be amazing.