I suppose if you own a house that you've had contractors working on, and you knew they cut corners and/or did things in a sub-standard or unqualified way, you would think it wise to not comment on that in an effort to draw attention to those flaws in an effort to getting them fixed.

To take your logic further, certainly, using that logic, you'd see no problem with trying to bury that information so that no pserspective buyer of your house would know it, lest it bring the value of the house into question.

Since you seem to want to call a spade a spade, make sure you use the right shovel and make sure you roll your pant legs up high enough lest you dirty them as you walk through your arguments.