Effects of time behind Precursor shield on Earth

The more I think about this, the more I am worried about this. After the Dread Lords war, until the Terran Crusade, Earth was closed off behind the Precursor shield. Shield that nothing could enter or exit. It sounds like a great protection, and it is, against Drengin and Yor. However, Earth really regularly receives things from space and is affected by things outside. Starting from light, going through meteors and even tidal forces from the moon. Even if the shield somehow let natural light through without allowing enemies to exploit it (it is an Arnor tech after all, so it could be possible), the other things are a problem. Especially since both are also elements of home invasion tactics in Gal Civ II and III, Planetary Bombardment and Tidal Disruption. Lack of asteroid strikes is not necessarily bad, but tidal forces are another thing entirely. And the shield cannot let tidal forces through, otherwise Drengin could devastate Earth with tidal disruption tactic. What effect would that have on Earth over 12 years? 

Not to mention, humans built 10000 ships while under that shield. While these ships were very helpful in defeating the Drengin, the materials used to build them had to come from somewhere. And humans had only access to what was within the Shield perimeter, that is, Earth and its atmosphere. How much of Earth’s remaining resources was used to construct these ships?

I want to know what do you think about this.