"I can guarantee that if you wear no strapping or tape the damage done to your ankle injury will be far worse.
Based on decades of looking after ankles".
What an amazing thing to have on your resume. You may well be right, ankle guards or taping may reduce the severity of the injury, or they may not; there is simply no way to prove this, therefore your statement "of guarantee" just does not hold. Scientific evidence unfortunately is not based on anecdotes, it generally requires a stronger level of evidence than this. This is Level 5 evidence - meaningless.
The problem with physiotherapy as a profession (assuming that is where you are coming from), is that a lot of treatments are based on very little evidence. That is why treatments such as ultrasound, interferential and even wax therapy, which were big in the 90's, have fallen out of favour - zero evidence to support their use.
If you can back up your personal guarantee with some data, I would be happy to change my view.