The power bill side is also not even clear cut. The longer processing time for slower chips sometimes ends up resulting in higher costs. It’s surprisingly not as simple as lower wattage chip is cheaper to operate.

Are some of them redundant containers? That’s just a lot of services to be running.

The download feature is always in some state of broken, but it has gotten a lot better over the past couple of years. If you haven’t tried it in a year or so, you may have better luck now.

I’ve used Ubooquity on and off for this. It has some nice features, but isn’t open source.

I don’t like Ubooquity, but Calibre somehow seems worse.