i've checked tvs a couple times (africa problems) on tk lh and ua, albiet 34 inch tvs.
first off, your tv will make it. it's packaged to handle that type of handling. you think baggage handlers are bad you should see how walmart and bestbuy employees offload trucks. baggage handlers get angry at heavy awkward crap, tvs are lovely to handle cause they're so light and stackable.
second, i dodged tk's oversize fee (based on chintzy dimensions) by claiming sports equipment: e-sports. for any yall familiar with baggage rules sports equipment is exempt from said dimensions and i asserted e sports. it turned into a curb your enthusiasm-esque moment that lasted 15 minutes and they gave up trying to collect the $100usd. and yes the tv was in fact for the purpose of e-sporting so none of yall better not cry ethics. someone more nefarious/cunning may put said tv box inside a surfboard or kite-sail case, the same way they can get around 3rd bag rules putting clothing in a golf bag.
most of the developed world yes
bad advice, mail and freight handling is even worse
in the usa, yes. in the rest of the world, not so much.
voltage absolutely will be an issue. while laptops, hair dryers, have voltage converters built in, tvs in usa use 120v (i think?) and i had to purchase a step down transformer (a 30lb thing) to bring down whatever (higher) voltage in africa is used. if you plug that tv into the wall and turn it on it will fry.
ntsc v pal is also an issue but also who still watches tv that way?
tvs are limited release because they're in a cardobard box. conditions of carriage on ua states that cardboard boxes are not covered for damage or loss, even though that fedex 23kg box is more durable than most luggage.
I would not worry as long as you are using original box