Part of the point of adopting EU standards wholesale is that many firms will not try to get out of them by bribery or lobbying.

Obeying local laws that the locals wrote themselves is extra work for the corporate machinery - If your officials are corruptible they might get bribed to avoid that workload. If the local law is "EU directive copied" and the corporation is already operating in the EU a whole lot of the time they will just whole-sale recreate the european operation, safety efforts, smoke stack filters and all. "Build a plant just like the one in Cologne, except with more airconditioning" is not a lot of extra work, and doesn't carry the risk of a pr disaster down the road.