Modern TV speakers are so bad that you need a soundbar just to get back to the level of bad audio present in any standard stereo mid-sized CRT TV in 1990. There’s no room for decent-sized speakers, they’re often pointed some weird direction due to space or aesthetics or both, and none of the TV makers care to try to make them work as well as they possibly could (see: the tiny speakers in iPads) because anyone who gives a shit is gonna get a soundbar or receiver anyway.