Sherlock Holmes can't show emotion in Enola Holmes, or Sir Arthur Conan Doyle's step great grandson will sue...
The Sherlock Holmes you know and love is a lousy character.
He's a misogynist, a drug addict, a condescending and ignorant man. But even that whole mess isn't enough to make him actually interesting.
No offense to Benedict Cumberbatch—who brought his dashing good looks and overwhelming sexual charisma to the character—but there's just not that much you can do with the famous master of deduction (who almost exclusively used inductive reasoning—shout out to the pedants in the audience). He's got some impressive speeches and some flashy tricks, but he's seemingly devoid of an internal life.