Thoughts on biosimilars?

Frustrated because i specifically changed my plan and joined Blue Cross Blue Shield and now I find out that Humira wont be covered in the new year and they want to give me on simlandi. I was on Hyrimoz last year because of other insurance issues and I felt fine but I’m worried about the biosimilars effectiveness. Not sure what to do. Why can’t companies just cover Humira anymore. It’s so disheartening to have to switch something that’s currently working for so many people like myself