Wired surveillance cameras - yes or no?

I will lay 230V and LAN cables,

What has become of your construction project anyway?

Cameras belong on a cable. Separate network (e.g. VLAN). Secured via UPS and remote backup.
On the roof structure it also makes little sense; these should be able to recognize faces. Planning is somewhat more complex than just looking at the price. Height, distance, angle, etc. are important here.
Good cameras cost money. In return, for example, you get better motion detection, night vision, transitions...
Motion detection should not run on the NAS or NVR.
Good cameras are e.g. Mobotix or Axis.
Access to the NAS is best via VPN. No Quickconnect as the bandwidth is far too low. Alternatively, open a port and connect the camera station to a separate network port on the NAS.
Rotating (PTZ) cameras always look in the wrong direction or require many overlaps. Such cameras are also more expensive. Better to use fixed ones.

Rely on Blink XT2 from Amazon. Costs 100 euros and is cloud-based. No work, no hassle, very reliable and works without cables, as it uses Wi-Fi and a battery with 2 years of runtime.

I am extremely satisfied.

It was about security. And cameras with wifi are not. Likewise, continuous recording with additional motion detection makes sense. That is also not possible with batteries. For just watching around the house, the suggestion is okay but has nothing to do with security technology.

That is of course true. But for a single-family house, normally sufficient. More is always possible.

It's just a gimmick. You can also leave it out. Better to have a mid-priced camera on a cable. It can be upgraded later. I don't want my recordings in the (fremden) Cloud either. Have you already read that employees of the big river partially watch the recordings?