I like to have my components separate, when technology advances I dont have to replace everything all at once.
Separate amp, speakers, entertainment boxes, etc.
What happens when a newer better version of smart TV comes out? Are you gonna buy that one as well? Sell the old TV? You do that twice a year you are gonna get irritated, especially if you have to go down in screen size an inch or two, or switch to a display technology you dont like as well.
I got my mom a Roku LT for 45 dollars. When something better for her comes along it will be much easier and cheaper to swap out than a whole television.