The doctors work to a required standard. This standard is mandated from the GCAA for the pilots' medicals not EK.
K you normally write some great posts. This is not one of them. The GCAA mandate the BMI. If you are over 30 then no medical. It is a GCAA ruling. If the docs pass you and are audited, they will lose their licence.
The doctors go through 10 plus years of training and have to pass an AME course. I think that qualifies them to interpret the GCAA rulings better than pilots. I guess you wouldn't like to be told how to fly your plane if one of the docs googled it??
The GCAA are cracking down on AME's left right and centre. An external AME Dr. RJ just lost his AME licence.
The docs are covering their asses. Just as the pilots do. Given the docs are undermanned, with morale lower than a snake's belly, and are incredibly busy, I really can't see them ordering extra tests.
Unless they need to.
Don't mean to offend. They don't have an easy job.
Happy landings