Perfect example of continual enshitification, there's no reason even a 15s "short" or other quick media couldn't have video controls, it's just intentional because some dogshit behavioural phycologist they've paid said that's the best way to coerce more engagement.
Behavioral psychologists working for TikTok, Instagram and the likes are like physical doctors working for McDonald's to make their junk food more addictive while blindly accepting that it will become even more unhealthy.
They don't see it as doing something wrong but as a challenge that they must overcome. The ethics don't really come into play in their minds because someone else will just do it anyway and they're just doing their job. Just like a police officer with their knee on someone's throat.
That is incompatible with a capitalist business model. Morality is nice and all, but please do that on your own time, during company hours we literally own your life.
Or when it looks like it's going to be a 15 second video, but actually it's been going 2 minutes and still hasn't got to the bit you'd have skipped to had it had controls, so you just close it in disgust.