The dev (Iberrymage) is fairly active in the matrix room and responds to problems with app uploads very consistently. (These problems should be fixed as they update the backend which is what's taking so long.)
Graffiti It has happened twice at least, and in both cases the maintainer stated he did send the new version on time, but the Accrescent verification process is too slow and it take days before actually publishing the updated app.
I have no idea what's going on with Qlango as I haven't seen any other devs complaining about multiple day delays. So far every time there's been a big delay it's because the dev either forgot to (e.g. auxio) or intentionally didn't cause they were waiting to see about bugs (e.g. aves). Also the case of the easy notes dev apparently losing their signing key for Accrescent. It sounds like Qlango is constantly having this problem, and I don't know how they could be hitting the manual review this much.
erikfritzek What's the explanation for that speaking of security?
It'll automatically be removed once it falls below the targetSDK.
They plan to (hopefully) open app submissions later this year once backend/dev console stuff is ready for more general use. They also received a large donation recently.