Hello, I just purchased the new Roku 65" Pro 4K Series TV, and those side-firing speakers work excellent, as they have plenty of power, however, Roku does make a special Bluetooth Soundbar which is a 2.0 channel wireless exclusively for this Pro Series TV, along with a matching bass wireless speaker for those who like more of a bang. Now, Qled is a 4K Series TV
while an Oled is an 8K Series TV. However, no channels are broadcasting 8K Movies yet, and only a few now, are broadcasting 4K Movies at this time. Of course, this will get better in time, as more people purchase 4 and 8K TV's.
Note; everyone has a personal sound preference, so with that, one might want a soundbar, but another will not.
My personal feelings, this 65" Pro Series does not need a soundbar, but this is me. Hope all of this helps.