If the goal of AB5 was to force Uber/Lyft to pay benefits for drivers, why did the legislation not focus directly on mandating companies to contribute towards h

If the goal of AB5 was to force Uber/Lyft to pay benefits for drivers, why did the legislation not focus directly on mandating companies to contribute towards healthcare expenses for all 1099 contractors (similar to SF mandates), rather than trying to force them all the classify their drivers as W2 employees? It seems like the latter path has many more unwanted side effects (e.g. many drivers do not want full time employment with required hours etc).