Haha, not a taboo topic, just one that has been talked about around here many times for the last several years. (and probably even more times in private or the moderator forum).
Essentially, the forums and the front page grew from different audiences, for different purposes, and since there was nothing tying them together a small animosity developed on both sides of the equation. The frontpage had been created and run from a source of voluntary love, being more of a financial burden than anything. The forums grew largely from half of the audience from the old Gone Gold site when that closed down and GT was still Console Gold.
There are certainly things that could be done to cross pollinate, but in the past most small posts that come from front page contributors in bursts at times tend to annoy forumites because they don't follow standard forum etiquette of contributing more than just a link and not creating new threads when a discussion already exists in a dedicated thread.
There is also often a backend change "just around the corner", coming with the next update, next forum software, next redesign, next plan, or whatever that will try to tie them together with forum logins being used on the front page and vice versa. But I think it just never happens because it's a lot of work and there isn't enough dedicated time/money/people to do that sort of thing for what is currently two very divergent audiences.
In the end, it might be worth it in the end to benefit both sides, but there is nobody to drive it to completion.