You can clearly see images even through a mesh. You don't need 100% of the light to reach you to have a clear image of something. Even a small portion of the l

You can clearly see images even through a mesh. You don't need 100% of the light to reach you to have a clear image of something. Even a small portion of the light is enough to get a clear image. Also, I would suggest just because we can observe things doesn't mean we can observe them from every direction -- there are directions that are more empty and there are directions where we can't see well. For example, large part of our sky is blocked by our own galaxy arms and center and we can't see well much behind it. And then there are things that we can observe only because we are extremely lucky (usually through gravitational lensing). When we say "we observed the oldest star" we don't mean there were no other stars at the time this one emitted the light. But yes, in general, our universe is so empty that most of the light after it became translucent will never hit anything.