I'll just point out since you highlighted encryption as a selling point for those unaware: Tutanota was court order to build a backdoor against one of their users. Not trying to blame Tutanota specifically, just saying relying on a third part to do the encryption for you is not bulletproof no matter how impressive the encryption sounds.

I used it very briefly when I used to use plex, but it works pretty much as it looks. I just didn't see a lot of benifits to that setup as I might as well just use Stremio if I wanted to go that route as this one was kind of a pain to setup. Not sure if you can get it to work "half stream, half download" in the way you want though.. You might be able to script something similar though. Since it mounts the debrid service using rclone, you should be able to transfer out the files locally.

It's not very clear what your asking for, but I think this is what you are talking about?

I used it for a bit and enjoyed how well developed it is, but I moved onto something different as I needed something more freeform. If the structure of BookStack works for you, you can't get much better.

Try putting an RSS reader on their like FreshRSS! Or a bookmark manager such as LinkAce! Start your own personal wiki/knowledge base with BookStack! Try deploying them natively, then learn how awesome docker is and put them into a compose file. Add wireguard into the mix so your services can only be accessed via a VPN.

Now get yourself a domain if you don't already have one. Pro tip if you want to maximize the cheapness of your setup, you can get a .xyz domain for .99 cents a year! Just has to be funny numbers, but find some numbers that has meaning and its not bad. Now that you have a domain, put those bad boys in a subdomain. Tired of those pesky browser errors? Time to setup a reverse proxy and get yourself an HTTPS cert. Caddy is brain dead easy to do this.

Why would not link to official docker for blocky? Bit odd to recommend 17 pulls vs the 1 million+ one. Easier for people new to the software to get help if something is not working if they are using the same thing everyone else is using.