I know this forum is flooded with all manner of complaints about the new UI and I hate to be adding to it, but.
One feature that I am sorely missing from the old UI is that this version severely delays showing you which file you've downloaded from the mod page.
Previously, when you downloaded a single file, there would be A. an arrow allowing you to go back to the file selection (personal peeve that it's gone, but I guess that's just visual), and B. when you would go back to the file tab, the file would show a cloud symbol with a down arrow to indicate that you have now downloaded it. That would be immediate.
Presently, that symbol only appears after five whole minutes. I have timed it many many times now.
That is, frankly, an insane and incredibly inconvenient delay.
Sure, if a mod has 10-15 files, I can just focus up and try and keep track of what I have already pressed to download. If I make an error, or get distracted mid-way, I can consult my download folder, I guess. Worse comes to worse, I'll just end up downloading the same file several times. That's frustrating and a clear downgrade from how things used to be -- but still manageable.
But what about truly big mods? Mods that have upwards of 50 files? 100 files? Those pages are unusable without this.
I know everybody has their own thing they want to see restored from the old UI. This is mine.