for the audiophile community i think the important thing to watch is what apple does with integration. i can't see apple music hifi being relevant if audiophiles can't use it with the variety of hi-end streamers, transports, networked DACs, servers, computers, etc. in their systems which utilize the various proprietary and subscription software that access and run those components.
if apple creates a closed system then apple music hi-res will be somewhat irrelevant to the hi-end community. OTOH, if they create an API for 3rd party integration which provides for music streaming then that is something for the smaller hi-res services to contend with.
to date, as part of their business strategy an apple device or apple software (app) is needed to stream apple music, unless there is something of which i am unaware.
note: there is currently an apple music API; however, it only accesses information about the media found in the apple music catalog and the user's personal iCloud music library -- i.e. just the meta-data.