In regular wallets, you can create an output that is worth less than the mining fees required to spend it. That is generally allowed. Maybe not in Wasabi land, but in electrum, sparrow, samurai etc, it is allowed. That does not mean it is smart to do it, but it gives you the freedom to do whatever you like with your money.
I heard you the first time:
No. Good wallets give you the freedom to do as you like. There are infinite ways for the user to mess things up if they choose to do so, the wallet cannot prevent you from every. For example, paying unnecessarily high fees is (and should be) allowed.
I guess I can't argue against someone who takes the stance "Wasting your Bitcoin and ruining your privacy should be allowed."