In my case: I'm reading this on the bus in a loud environment where I pay through the nose for mobile data.

Videos have higher time commitments than well formed descriptions. I grudgingly clicked on the video because there is no description, but I almost closed the tab instead. Then I immediately skipped to the middle of the video anyway.

The information to time ratio on videos is almost always extremely low. I can spend ten seconds skimming a description, or a couple of minutes waiting for a demo video to finally get around to showing me what I'm interested in.

Videos are great for showcasing a game or a movie where the visuals are the most important part. They are awful for an app where the most important thing is what functionality it has.

Demo videos are not suitable for play in certain situations - like when I don't have headphones.

My connection is crappy and I don't expect the video to load reliably.