Or to put it another way, your Allianz insurance will still work if you need it, and it is probably helpful and desirable to have it.

The compulsory insurance you must purchase as part of your EHAS application is very limited in scope, and is not at all comparable to the coverage under your private Allianz policy. However, you still must pay the $15 US per person for the mandated policy in order to enter Sint Maarten, even if you have more comprehensive coverage elsewhere.