We pray because we are ordered; we fast because we are ordered; we convey Islam to non-muslims (dawa) because we are ordered.

We make extra prayer because it is recommended; we use Miswak becuase it is recommended etc

We may prefer to take more than 1 wife because it is permitted or we prefer to exercise 5 times a week because it is permitted;

we might divorce even though this is disliked; or grow our nails even though this is disliked

We avoid certain foods because they are forbidden; we do not disrepect our parents because it is forbidden or partake in intimate relations with the opposite sex outside marriage because it is forbidden.

These are all rules in Islam just like the taking of more than 1 wife.

It is not a rational discussion; we just need to understand the rules and implement them accordingly.