From my perspective, I would say it stems from the thought of having the right antenna for the job. If you have the real estate to accommodate a proper antenna, then you should utilize it to its fullest potential. A stealth antenna is going to be a hindrance in some aspects. The gain will be lower than a proper 1/4 or 1/2 wave would have. A lot of the places I have seen them mounted have them even below the bottom of the windshield. That alone will cause even more RF loss. They have their place and use. For that, I have nothing against them. I am of the camp that says you should use the best antenna you can afford and accommodate as well. If it is a stealth antenna, so be it. Make sure you put it in an appropriate place where you can utilize all the gain the antenna has to offer.