Please, someone educate me on this issue...

We are used to the notion of 24/192 sampling rate on Meridian - and others’ - products.

However, when looking at something like Quad’s Artera Play, with it’s USB sampling rate of 384kHz, and, Teac’s NT-505 being capable of 32bit 784kHz PCM. (both products have/will have MQA)...

... What are the benefits (and issues, if any) of such higher sampling rates?

My Mac can go all the way to XI - Mac user since 1988.
Meridian owner since 1993.
M6, 218, 504, 506.2, AC12, SBT, ReadyNAS, Mac Mini Server, Amarra4, Loewe Bild7.55.
In storage: Meridian 551, 555, A500, Director. VDH Teatrack, Mission Elegante e82, e81, e8c, B&W PV-1.