If you could remove one rule of grammar, which would you choose?
English isn't my native language hence it'd feel presumptuous to consider changing grammar rules.
That said, language is a living, changing construct. These rules aren't set in stone and will change through (lack of) use over time or by some language keepers deciding on changed rules (as happened for German grammar during my lifetime). So, these rules may be there for a reason, but not forever.
