50/50 is very arbitrary number too
Why not go milder like 30/70 or 40/60? Why not go wilder like 60/40 or even 25/75?
In my opinion just let author dictate how much curation reward they are willing to give on each post. If an author believe higher curation will be beneficial they can set it to any number higher than 25/75 and vice versa if it's allowed.
Sure, it could also be 75% curation and 25% author. Authors could even set it themselves, even though it could become confusing for people to understand. I personally think 50/50 is a good number, because it's fairer than anything else.
Because human dont vote after more or less 15 min all day long.
I would argue the curation curve should not even start until after 24 hours after the initial post time. Give everyone a legit chance to read it or know that it was even published and have 2 curation windows, the 25hr-72hr window, then immediately start back up again at 72hr+ to 144hr then it stops at the start of day 7, that is for the curation window of the post. That way if you miss a vote on post you can still hit another sweet spot of curation later on to encourage possibly more voting on a really good post that may take 4-5 days to get to you.