It's about a project that silently ignores a privacy-related setting, which then exposes the fact that people download something.
I support him on Patreon (https://www.patreon.com/deluge_cas) where he sometimes posts updates but it's clear that he's very busy with other things (Including going through an illness) so I'm not blaming some open source maintainer for picking up a 10 year old, apparently hard to reproduce issue with a total of 45 comments.
The client can be used just fine, except for a small buggy behaviour in case if you are using a proxy which likely isn't used by the majority of users.
Saying it’s “likely isn’t used by the majority“ is bad form, in my opinion. You don’t know that. I don’t know either, to be sure, but it makes me personally lose faith in the security aspects of the project.
Which means that everybody who either doesn't use a proxy or does not care whether it's exposed what they are downloading can happily use Deluge. Using the term "nobody" you are exaggerating quite a bit, don't you think?
Instead of complaining and demanding that others fix something for you for free who are not affected by it, please consider contributing a fix yourself.
Note that I’m not demanding anything. Or complaining that it isn’t fixed. How could I? The person developing it, may have their reasons which I don’t know about.
However I am pointing out the issue, because there are more secure alternatives out there, if privacy is what you value.
If you think that’s not much of an issue, that’s okay but I definitely didn’t like it.
That's pretty harsh for the client just not supporting one non-essential feature. Many power users of Deluge or other torrent clients run it on seedboxes where a proxy isn't needed and would also negatively impact the speed.