"But what if they want a removal?" Good question. treehumper's right on the money; you gotta see through their initial words and find out what motivates them.
What if they want a topping, or fertilizing a tree with fungal problems, or cabling a Ficus carica with big throughbolts and chain(which I just saw yesterday)?
You'd try to educate them, right? If they want to remove a tree because it's too big, or makes litter, or the roots are messing up the lawn, wouldn't you try to educate them about reduction pruning, or mulching? To comply with the ANSI A300 Standard (or the superior UK and German standards), "the arborist SHALL establish the objective" by hearing the owner's goals, considering arboriculture, and describing reasonable tree care treatments, one of which may be removal.
If you don't want to comply with A300, you can accept the owner's goal, and not think about establishing the objective. Technical rigging is such a rush, immediate gratification, booyah. Big machines have big payments, so that big check today can look better than many checks over a lifetime. All true; hard to resist. Your call.