Loxone roller shutter control simple control?

That depends on the manufacturer, each has their own mm specifications but around 65mm.

Are there any similar systems like Bosch that are recommended?

Most of them are not recommended because the majority are proprietary and you enter a vendor lock-in. I would look into z-Z-Wave or EnOcean if it is not going to be wired.

The easiest way would probably have been with Geiger Air motors... For us, with 11 windows, including blinds and 3 roller shutters, that was 10,000 euros... Apart from the fairly simple connection situation

I think I'll go with the Bosch system. I just need to test if the signal passes through the concrete ceiling and covers a distance of 10m.

One more small addition regarding the supposed DIY solution in the form of Shelly 2.5. I have partially installed it as well, and it has been running absolutely stable for several years. I also had no problems with the connection.

One advantage is, of course, the price at first, but the app also works great. Integration with other smart home systems is very easy (MQTT), and if you don't like the installed software, you can flash a different one (e.g., Tasmota). This makes it completely irrelevant whether the manufacturer eventually shuts something down, whether updates or the cloud or both.
In addition, you don't need special adapters for the buttons/switches since you use the existing ones.