I do see what you mean, I will tread lightly with this as I do not want to start a twin vs single debate. My reason for a deiced baron is this, 40% of the time I have 4-5 people family and friends usually, I only fly alone when going to work, 1620 UL give me what I need to carry what I need inside and enough fuel to go 800 miles LOP with NBAA IFR reserves. I agree with you regarding engine out performance, if I had an engine failure in icing conditions that would be an emergency to me and all I would ask of the other engine in that instance is to make the airplane a very good glider. But 99% of the time both will be running and you can climb through the icing faster than most singles. In my experience the only twin vs single that I have flown that would not be good is a 1966 booted twin Comanche compared to a TKS equipped 1994 Mooney Bravo. I say those two because I have actually flown both and no question the Bravo puts the Comanche to shame. You can't deny simple physics a 5200 pound baron with 570 hp gives you a 9.1 power to weight ratio, a bravo at 3300 pounds with 270 hp gives you a 12.2 power to weight ratio. Up to about 10000 feet the baron will out climb a bravo. Lastly even though I am looking a a baron I posted on mooney space because the is no disputing that mooneys are the most available GA airplane with TKS so I figured that mooney owners would be the best source for information regarding TKS.