[@Sophrus] I think if you can reasonably argument energy shields, you can have them - depends on what you picture under 'energy shields' and how strong it would be, there should always be some limitations. But since we don't do aby calculations here and all conflicts and battles are settled by mutual player agreement, it doesn't matter that much.
No FTL and interstellar communication is a base rule.

I'm gonna repeat myself, but I recommend joining Discord if you can, there is always someone to answer any questions.