Apple's ProMotion, adaptive refresh rate, not very adaptive

I am no expert, so I had to basically stumble onto a solution to correct broken media play in AppleTV app playing videos… by asking The Google AI buddy.
I was able to correct glitchy playback by simply(?) opting for 60hz refresh rate for the display settings.
Am I missing something?..
I am a bit boggled why Apple would set ProMotion as the default setting.
when it doesn’t handle its own content very well.

System: MacBook Pro 16" (Nov 2024) M4 chip, Mem: 48BG