Can it even be said that it was perfected when later we switched from carbon filament to tungsten, and from there to halogen-surrounded tungsten.

And on the other side, Edison’s lamp wasn’t even the first one to be mass produced and commercially sold.

There’s a certain style of education that really wants to draw a hard line between “before the thing” and “after the thing”, and credit its invention to a single guy. But in really the line is quite wide and fuzzy.