The point is that there are so many others things that should be focused on instead of a decade old feature that a small percentage of players have even used.
what's the relevance of pointing out that it's a 'decade old feature'? if anything that strengthens the reasoning for our desire to see a feature that has helped to define halo since the beginning move forward alongside the rest of the series, especially in an era where hardware can actually do it justice better than ever. and you can imply that only a small percentage of players played halo splitscreen all you'd like but if there's one splitscreen game where that's the least intuitive possible explanation, it's halo. shitloads of people grouped locally to play multiplayer and the proof was there every time you'd hop online.
I don't see anybody saying this I'm sure if you asked most they would tell you they absolutely did splitscreen at one point, most are saying that it is used way less in today's world.
'it is used less'
again, it's not simply used less, it's not even given as an option in most games, and it's been clear since last generation that that transition hasn't simply been a result of us not utilizing the feature, but often because things like getting hefty sexy engines to run on aged or weak hardware take precedence above all to pubs and marketers.
it's like, if over the course of this generation, publishers and devs alike start to drop resolution in their games in order to keep them running well.
and then by the end of that theoretical generation, when every game is 800p, i'm surrounded by people telling me, "well nobody even uses 1080p anymore so"
well
no shit