It only takes a second to scroll down to the bottom unless you have some individual with a few thousand photo's. I have about 500 of my wife and it only takes one second to scroll down to the bottom. I don't consider the time factor as a problem. If the photo's, excluding undated, are not in date order, then the problem is how they were dated.
I never suggested it was wrong to have the earliest photo's at the top. Whether earliest is first or last is, of course, a matter of personal preference. I just prefer the latest at the top. I don't think that's nonsensical as you suggest. You prefer them the other way around and that is, of course, your preference. I have no real objection to that if the majority of members prefer that option. However I am quite happy with what Tribalpages have done.
What will be nonsensical is members making this a major issue.