“row 1 Club Europe or 2D on the Embraer flight from/to LCY several times a month. These are front rows, but not exit rows”
I have to take issue with you. I also travel on these flights at least 2x a month, and I choose to sit in rows 1 or 2. These are shown as exit rows on the seat map and when you select them, you have to confirm that you are physically capable (I paraphrase, of operating the doors etc.)
As others have said, its best to obey the CC and putting away a laptop or iPad is only a momentary inconvenience.
What concerns me more on these flights is seeing adults with a baby in arms seated in these exit rows. How in an emergency could they be expected to help?