I have to be honest though, I still don’t quite understand why wired is supposed to be so much better.
It’s not always about "always" here. In the case described, however, from my point of view it is indeed better, at least that’s what I decided on recently. As Mycraft already wrote, more robust, independent, and therefore more flexible in the long run. Both in terms of long-term "technology adaptations" and from the user’s side.
I felt exactly like you. I’m not opposed to technical gimmicks, but I’m not willing to invest tens of thousands of euros in KNX or similar. Therefore, we chose the "simplest" solution with the general contractor, meaning the normal electrical connection for the roller shutters, with the idea of keeping all options open afterwards for the "wireless connection." After moving in, the roller shutter control should be integrable into HomeKit; the choice had already fallen on the eltako 64 series. Since the latter has not been available for over a year (delays in certification) and no concrete delivery date can be given, I eventually switched to the Bosch flush-mounted switches and am very satisfied so far. (Identical in construction to those from Homematic, but not compatible.)
These things are installed in 3 minutes, cost between 40-50 EUR each, and work as they should. Compared to that, Shellys (which I also had) with their additional disadvantages are nothing. The (inexpensive) Bosch controller is also required, which I initially actually wanted to avoid (like, for example, Eltako), but since other smoke detectors etc. are also connected to it and these are, by the way, partially compatible with Hue, it ultimately doesn’t bother me.
The advantage of the whole thing is that there is an individual wired switch at each roller shutter. Sitting next to it (window, terrace...) and wanting to quickly close/open a single roller shutter just takes a short press of a button and that’s it. Any child, visitor, the wife, etc. can easily do that... Especially concerning the wife, the "acceptance factor" of these "technical solutions" should not be underestimated. At the same time, however, all kinds of gimmicks and possibilities are open wirelessly. Whether you control each roller shutter (with status info open/closed) by voice or smartphone button, or open/close all at once = centrally, or configure any custom scenes... there are virtually no limits for around 500 EUR for the entire house as a wireless solution.
If you ever become dissatisfied with the choice of technology or want something else for whatever reason, the flush-mounted switches (by the way with existing adapters for all kinds of switch series and manufacturers) can be easily exchanged in a very short time.
This would not be so easily possible in your example with Somfy, or at least it would be significantly more complex and expensive.