From experience there are two views from the flight deck; if you’re never sick (or happy to operate when you shouldn’t), sickness is a perfectly fine tool for the selection process. If on the other hand you do take the obligations of your licence seriously (or like to swing the lead) it’s a concern.
Would be interesting to see what the feeling was if it was based on extra fuel carried tables, which also makes business sense.
Neither stand up that well to the bigger safety picture.