Edge lit = cheaper, less power consumption & thinner bezel, but poorer brightness uniformity,
Back lit = more expensive, even uniformity, but more power consumption and the resulting wasted heat generated.
Local dimming only really works on full array, but you pay for it.
Free, abundant OTA television separates this country from many others. ATSC1 has only been in force since 2009. The wireless industry has enough spectrum. Enough of 'planned obsolesce'.