As someone who plays a chemist with two characters, I disagree about chemistry. I find it quite a fun job to do! That said, it's good to have MD or Residency in your character employment history too, as you can then at least also involved yourself in basic tasks such as using health analysers on new patients, scanning them, administering non-surgical treatments etc. It lets you get involved in little jobs around Medical without taking the piss.
But your experience may vary.
Personally, I like the general changes to Medical. I've altered one of my characters to better fit these new guidelines, and I think it's help me take a more focused approach to what I want my character to aim towards in their career.
I *like* the fact that the new guidelines limit what characters can do. Having "jack of all trades" medical characters who can do almost every single job is so meta and powergamey, and this helps to prevent it.