Edison didn't invent the light bulb. What he set out to do, and did was invent a system that would make home electric lighting less expensive and better then the gas lighting used at the time. To do this he improved the light bulb to the point that it gave off a reasonable amount of light and lasted a reasonable amount of time. He added to this the light base and socket, the fixtures, the wiring methods. switches, fuses the distribution system, the 3 wire shared neutral system among other parts of a home lighting system. He also hired and trained electricians to install all this and set up manufacturing plants to drive down the cost of light bulbs.
He got the AC DC thing very wrong no doubt about it he also didn't think to invent outlets for appliances. Overall he got a lot right and we all have benefited from it.