IoT type devices have mixed support. Even if v6 is supported by the device some stuff in general can be squirrelly if you connect it to a v6 only network. Pretty much all typical user operating systems work fine on v6 only networks though. Windows typically uses v6 LLAs to connect to printers even if the network has no v6.
Tl;Dr: yes, for the most part
IoT type devices have mixed support. Even if v6 is supported by the device some stuff in general can be squirrelly if you connect it to a v6 only network. Pretty much all typical user operating systems work fine on v6 only networks though. Windows typically uses v6 LLAs to connect to printers even if the network has no v6.