Again, I am a medical professional. But yes, inconvenient is exactly it. It's not making people safer, it's not preventing suing, it's not protecting anyone, it is just a form to sign so someone would have a hard time suing the dive shop that rented me equipment. The same thing happens when conditions are omitted. Exact same outcome.
You are talking like everyone who goes for a diving medical is passed fit. The people it really matters for are those that are stopped from doing something which might kill them. Apparently that is not you, but that inconvenience is the price of finding out it is not you.
This scheme is a risk based filter. Higher risk people have to get a doctor involved. The idea is to keep the very high risk cases out of the water.
Dive instructors are in no position to make these judgements. For example, they don’t know whether some particular drug for controlling some particular condition is a problem or not, they will only ever be guessing. So unless the instructor is prepared to accept people dying what are they to do?
Given the physical condition of people who do dive, and what that says about fear of death, I suspect that we’d have plenty of people with genuine issues deciding to dive or being unaware of the risks if they were not pointed out by forms like these.