My doctors dont use the word brittle anymore, it isnt as common to say it as it used to be.
But, my pump trainer said it will never ever be easy for me. Food doesnt react the same at any given time, things like stress and even arthritis pain play into it, and even the possibility of slower stomach emptying (not necessarily full blown gastroparesis).
Type I's can do nothing but try to get it decent, and if you are a type II and want to try supplements, it's kind of your call.
But lots and lots of us are far from having exceptional numbers, and it truly isnt always anything we can help.
There are zillions of factors.