It's because everyone is tired to hear about this. FD has given answer many many times. People still don't accept that. People try to make it more important, how many people are complaining about it.
Can we move on from this topic?
So why do you think the question keeps being asked? It's because the tone and context of the FD replies, not the conclusion itself.
Consider:
Answer 1: Open and Solo are equally valid so nothing is changing. Move on, nothing to see here.
Answer 2: We have followed the open vs solo megathreads and understand the argument that it is relatively too easy/risk-free to participate in joint efforts compared to open, and the issue that there is no way to directly prevent progress towards a goal being made by opponents playing in solo. We understand there are views on both sides and in between the arguments and that this is an issue close to many people's hearts. We do not wish to exclude players in solo from participating in community events as we want them to have access to the whole game outside of the direct PvP element. We have considered a higher reward for players participating in open to offset this but would prefer to keep the contributions equal because [insert whatever reason this may be for...]. We have considered other options/rewards for encouraging open play versus solo play but prefer not to implement these because [insert reason etc]
We're getting (1). This is clear, but dismissive.
I'd like (2).
Too much to ask?
And finally, Frontier may view Open and Solo as "equally valid" but they are certainly not "equally balanced". Why desire the former but not the latter?