I just found your blog post comparing various dataframe libraries. As a total Ibis lover, I feel like the post is now a bit outdated, as Ibis now has great support for a lot of the missing holes that you found. I really believe in Ibis and I want other people to use it, so I want it to have a good reputation.
What would you think if I added an EDIT: disclaimer at the top of the ibis section showing the new code that works? Keeping the old analsis talking about the rough edges makes sense though.