Then it's not worth your bandwidth, fine, whatever.
DownThemAll lacks the features you're after, understood.
Other people find the other features useful, but not you, OK then.

We're limited by the WebExtensions API and were upfront about it. That means you can only save into the Downloads folder (or subfolders therein) and you cannot have checksums. If you don't like that, fine, I don't like it either, I hate the WebExtensions API, but it is what is is.

But all this doesn't mean you have to come here and express your disappointment in the in the meanest way you could muster.