From what I can see most of their products (all?) are z-wave, so even if they try to change as long as they don't break the z-wave support, you can buy a z-wave USB dongle and drop whatever wants to be directly connected to your network anyway.
None of the Shelly devices I have are z-wave, they are all Wi-Fi entirely. This includes several of the Shelly 1 power management in-wall relays, several of the Shelly external power management plugs of the kind that you plug into an outlet, a few of the Shelly in-wall dimmers/fan controllers and a couple Shelly bulbs.
I think if these had Z-Wave they would have cost a few dollars more each, due to licensing. It would be nice because I do have a Z-Wave mesh up and running alongside a zigbee mesh and a few oddball Wi-Fi only devices like these shellies, but they work well enough with home assistant that I don't consider to be a drawback yet.
The only thing I wish they could do better is expose more of their configurable options via whatever API they present to home assistant. A couple of these devices speak mqtt which opens up a few more capabilities, but there are still many fine-tuning aspects like controlling the way a switch attached to the device functions, i.e. whether it behaves as if it is detached or functional - useful with toddlers around) are invisible unless you are using the built-in web configuration page.
