This sounds more like a Lemmy feature request than a Summit one. Summit is only one of many apps that you can use to access Lemmy (like all the Reddit apps before the whole API mess a few years back), not to mention the web interface itself if you’d rather not use an app at all.

I think you can request new Lemmy features on the GitHub, but I’ve never done it myself.

Is this a statistic that Lemmy itself tracks? I haven’t heard one way or the other, but if it doesn’t then I’m not sure how realistic it would be for Summit to implement. It could maybe show you how many times you personally have viewed a post (not sure how valuable that is, though) or how many times a Summit user has viewed a post, but the latter feels like a bit too much data collection for questionable return, imo.

If this is something that Lemmy already tracks, though, then adding an option to view it would be great! More options in general is always my preference, even if I don’t necessarily make use of them myself.

I haven’t had it only give me lower quality options, but awhile back I noticed it was always defaulting to lower quality so I installed the YouTube High Definition extension. Haven’t had an issue since.