Name some technical boxers who were very good offensively. Some of mine are: Holmes Leonard Toney Mayweather (as PBF) Judah
Yuri Arbachakov. He was more of a boxer-puncher, but technical, nonetheless. I always found Harold Johnson appealing in this regard. Sergey Kovalev and Kostya Tszyu come to mind, as well.
Alexis Arguello Jose Napoles Eder Jofre Ricardo Lopez Roman Gonzalez Mark Johnson Carlos Zarate Orlando Canizales Yuri Arbachakov Juan Manuel Marquez
You forgot two of the best: Hector Camacho & Benny Leonard, two experts at making opponents miss, then scoring when they were out of position
Based on what little we have of him, Sam Langford. Almost all sources say he was a great technical boxer for his time. Couple that with his murderous KO power and I really think Langford had the most dangerous combination of offensive techniques for his era.