You can also buy commercial dumb TV's that usually have hdmi and displayport for a little more money, at any size, and add your own smarts at will. They also last longer because they don't intentionally under build the power supplies.
You don't need speakers: the built-in speakers in TVs aren't decent either, so you have to add external speakers.
The backlight issue is valid though. Also, 32" or 36" is tiny. It's fine (really too big IMO) if you're sitting in front of it at a desk, but for watching from a sofa from a distance, it's too small these days. This isn't the 20th century with NTSC/PAL resolution any more.