A Respawn dev explained why Octane hasn't received a movement speed buff in the latest season despite multiple other Legends receiving much-needed buffs. Added back in Season 1, Octane has always struggled to find his place in the meta.
While being a "speed demon" the character has only short amounts of burst, and doesn't have much else to his kit. His Jump Pad can be used to run away or engage an enemy team, it's situational at best. So an Apex Legends fan asked Respawn Entertainment’s Design Director, Jason McCord about his kit.
His response encapsulates the problem with Octane's kit in general, "We struggle with making Legends too fast. It really destroys understandable combat when someone can flank and reposition too fast. But we know Octane is "speed guy" so it's tough."
Why make a speed character at all if you're going to be too afraid to make his kit viable? Speed in shooters is king, giving players the ability to dip and move out of combat at will. So if Respawn knew of the problem beforehand, they should have never built a Legend whose whole identity is built around speed.