This is a good starting point if you want to dive in.

What are the reasons for the Pi Hole to Adguatd switch?

Not sure, maybe “diagramming”. Btw there is a good alternative to draw.io for self-hosting called Excalidraw. Very easy to set up with docker.

Nice list! Btw draw.io is not optimized for mind maping. For mind maping I use Freeplane and realy like it.

YT plugin for Kodi is quite decent. Have it daily in use, no issues so far.

It’s trillan you are talking about. I am old too :D