That is different, such laws are unenforceable because they have been ruled to be so by a court. The problem is with laws that are unenforced, but are still enforcable. If the situation of having unenforced laws becomes normalized, then legislatures will indeed not "waste time" removing them, and such laws will be only unenforced until some official decides they don't like you.

I doubt that people whose lives/finances have been ruined defending themselves against vindictive/overzealous prosecutors and litigious citizens would agree that this is not a dangerous precedent. Being dragged through the courts based on outdated or unreasonably applied laws can ruin a person's finances or reputation even when they successfully defend themselves.

The minors on trial for sex crimes for sending nude pictures of themselves, as well as innovative business being stifled buy outdated protectionist regulations, may also have something to say about it.

Outdated, unreasonable, misinterpreted, and in some cases know unconstitutional laws, can be used as tools to attack and harass.

The fact the Constitutional action is not being taken to remove these laws and regulations from the books is not an argument for them to continue existing, but rather an argument for the need to change how the government operates in regards to updating and clarifying the law.