Wireless WiFi data connections for streaming work 100% fine as long as you have a strong connection. That’s all I use. The key term here is it’s just another network data connection. You just need enough bandwidth to keep the data streaming. There is no sound making involved until the data hits the streamer and then goes to the DAC. Same story with modern hi res smart TVs. All you need is the network bandwidth.
I own a Cambridge Audio Evo 150 all in one among other hifi gear. The only wires with that when streaming is to the speakers . So nice and sound quality is top notch/ big league for sure.
Obviously wireless subwoofers are a thing as well. I use one with a tv soundbar but have not tried in a good system.
Wireless technology for hifi is everywhere. Young people use it with no remorse. Old, set in their ways, 20th century vintage audiophiles: Not as much.
I’ve heard some very impressive sounding Bluetooth headphones recently. AptX lossless does CD resolution over Bluetooth these days. So there is now also that.