I for one would like real horizonsof some kind visible at alt. While it might not be 100% realistic to have a horizon clearly visible to the sides at 30k, IMO it is a necessary compromise since we don't have a realistic view system either.
Right now, when flying around inside that big blue sphere, it is way too easy to get spatial disorientation in combat. You have to break eye contact with the enemy to figure out what your attitude is - and "lose sight, lose the fight".
Artificial horizons? Those would be caged during ACM anyway - or broken.
Give me a sky gradient and I'll be happy. That's not even unrealistic, the sky is not the uniformly blue we're seeing at altitude in real life.
Cheers,
/ft