I use qBitTorrent and I disagree that any of those things are hard.
The web UI does the job, no complaints.
Hosting multiple services behind one ip:443 and having a valid LE certificate is surely a nice thing. You can even add a simple URI knocking if you wish.
Putting nginx in front with http basic auth would prevent all of them.
I understand that Hacker News users are generally power users. If qbittorrent fulfills your needs and you have the skills to setup and secure a webserver, there is no need to switch to another client. Additionally, it's worth noting that PikaTorrent may not implement all the features of qbittorrent anyway.