Planning electrical systems to be future-proof

In the end, I decided on 12U. Once the patch panel is installed with the patch cables, the vast majority will never want to change it again. In this respect, a bit more space would be more future-proof.
This is how it looks for me now:

Then I will probably go one size up as well. My second backup hard drive is almost 15 years old. Therefore, I could well imagine swapping it out for a NAS at some point.

A proper labeling on the patch panel is definitely recommended. But if necessary, you can still catch up on it or make it look nicer afterward.

Here, I would only give the electrician the instruction to label which patch cable goes where. Whether he also plugs them into the patch panel for me or I do it myself afterwards doesn’t matter to me. I am quite sure that I will make the external appearance a bit nicer later anyway.

If you have the freedom, I would have the electrician run a line from the house connection to your network cabinet.

Our electrician then installed a TAE socket for the incoming line in the rear area of the network cabinet. From there, I was able to connect the Fritz!Box directly:

Do I understand correctly that the incoming line from the house connection leads to the TAE socket in the network cabinet? Does the Fritz!Box require any additional connection besides power, or is it then fully connected? Our appointment for the Telekom house entry is not until November. Does it make sense to coordinate with the electrician to install a TAE socket in the network cabinet (like you did) and lay the line over, so the Telekom technician can connect it later? Is that realistic in practice?

It's not quite clear to me why one should lay cables that support much higher throughput than the connector/form factor supports, call it what you want, but okay... people also rarely drive 500hp engines with transmissions that only go up to 120km/h.

However, the original poster would like to use cat 7 cables with gg45 connectors, I suppose.

The OP would like to use cat 7 cables with gg45 connectors then I suppose

And then he plugs them into which devices? Or are you mixing up connectors and sockets? I agree with patch panels with GG45 if you really want to be sure.

I’m not quite sure why you would lay cables that support much higher throughput than the connector/design supports, call it what you want, but okay... you also rarely drive 500hp engines with transmissions that only go up to 120 km/h.

But the OP would like to use Cat 7 cables with GG45 connectors, I guess

So with Cat7 and RJ45 you can easily transmit 10Gbps, with Cat8 and RJ45 likewise 40Gbps. Where is the limiting factor here compared to GG45? The limiting factor is not RJ45, but the installed network cards at the ends or in the intermediate devices like switches.

Moreover, RJ45 is simply the standard. Any consumer device (unless connected via Wi-Fi) has an RJ45 port.

Furthermore, cables are much harder (if not impossible) to replace compared to connectors.

Where is the limiting factor here compared to GG45? The limiting factor is not RJ45, but the installed network cards at the ends or in the intermediate devices such as switches.

Exactly. No idea why ignorant people get so confused here. If not even the connection of a FritzBox is clear, there's no need to start talking about 10/40/100 GbE. Especially when a lot gets mixed up by the "knowledgeable," the questioner only embarrasses himself with the electrician if he comes along with that confusion of terms.

Exactly. No idea why ignorant people get so confused here. If the connection of a Fritzbox is not even clear, we don't need to start talking about 10/40/100 GbE.

Do I understand correctly that the incoming line from the house connection leads to the TAE socket in the network cabinet? Does the Fritzbox need another connection besides power, or is it then fully connected? Our appointment for the Telekom house installation is not until November. Does it make sense to discuss with the electrician to install a TAE socket in the network cabinet (like you) and lay the line over, so that the Telekom technician can connect it later? Is this realistic in practice?