On youtube's desktop site, I've also noticed that sometime within the last couple months the home page no longer shows the duration of videos when the page loads. After 3-6 seconds, the timestamps pop in. I don't know if this is intentionally or a result of lazy-loading - but seeing that the video thumb, title, author, view count, and age all load instantly with the page, I struggle to come up with a reason it could be unintentional.
This bothers me because I like to know how long a video is before I commit the time to sitting down and watching it. This feels like an attempt at a dark pattern with the intent to improve metrics - surely watch time is a metric youtube cares about.