Smart home standard roller shutter motors in new buildings?

For flush-mounted transmitters/receivers you would really need a push button everywhere, which we actually don't want - that would probably be the emergency plan.

I would always have wired push buttons installed for each roller shutter. In case the radio connection fails, you can still control it. Relying solely on wireless is, in my opinion, extremely naive. Pure time-based intervals are also nonsense. These should only be solved with window contacts that prevent the roller shutters from going down when terrace or balcony doors are open.

You can still retrofit the motors for wireless operation, for example, with Shelly (WLAN), Eltako (Enocean), or Fibaro (Z-Wave) flush-mounted modules and also program time intervals or similar. I advise you to seriously think about what you actually want to implement. For up/down via wireless, the modules and a wireless central unit (e.g., Homee) are enough. For other features, you might need additional modules.

Shellys. Regular switches for that. Nothing more is needed and it is very inexpensive.

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If the radio connection fails at some point, you can still control it.
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In what scenario should that be possible?

In which scenario should that be able to happen?

With Shellys: WLAN malfunctions (network overload, unstable connection, ...) With Fibaro: wireless switches are dead and smartphone is not in direct range Eltako/Enocean I still see as the most stable, since the wireless switches operate without batteries, but depending on the size and material of the house, an Enocean repeater is needed here and there. Wireless is always a tricky matter. And judging by how the questioner writes here, I don't believe he has a deep understanding of the subject to fix errors "just like that." That quickly leads to annoyance and dissatisfaction. People in the house have light switches and sockets everywhere. So why would you want to do without such switches on the windows? They don’t make the house any uglier either.

In which scenario should that be able to happen?

In the scenario where radio solutions demonstrate their technical deficiencies, and there are quite a few of those. Range issues, interference with other transmitters, overlapping with too many simultaneous control commands ... just the usual practical problems known with radio solutions.

Look at Shelly's. I have already gotten some myself. The 2.0.

If anything, the 2.5 would be more recommendable? I am eagerly waiting for the Eltako series 64, which should actually have been on the market by the end of 2020 or beginning of 2021. Unfortunately, availability is being delayed and they are talking about the end of 2021. From my perspective, it is currently the best choice – although so far only on paper.