Installation, setting up IoBroker - still "configurable" at an old age?

Without having read everything now, I can still recommend Home Assistant to you. Installation (with experience in VMs) took about 15 minutes.

Before that, I also played around with ioBroker and then with Edomi for my KNX visualization/logic engine. I discarded ioBroker relatively quickly. I still find Edomi (pure KNX!) great, but also the most complex.

Home Assistant is the perfect middle ground for me. There are many plugins, the UI looks good, mobile app, and so on.

Is the visualization "responsive," i.e., can it adapt to the resolutions of different devices? I am currently in the process of learning (or rather not learning) my enocean actuators. I am currently testing a "not released yet" adapter, and there is still development work on it.

But I might take a look at it tomorrow. Meanwhile, I still have to optimize my heating...

Yes, it is responsive. There is also a demo on the web. Just search for it. Unfortunately, links are not allowed here in the forum...

I use Iobroker to connect Homekit to my smart home and a few other little things. Of course, I could manage that without Iobroker as well, but I just get a GUI for the Homekit configuration and prefer to click it together rather than edit dozens of configuration files by hand.

Whether it will run stable over many years I don’t know yet due to lack of experience. But in case of doubt, only a few little things and the Homekit connection would be missing. The rest of course works without Iobroker and co.