Downloads do not play instantly

Just a bit of a frustration, when comparing Roon, to say er, Plexamp.

When in a location with poor signal, and playing a downloaded track, Roon will not play that track instantly, despite it being downloaded and available offline. Whereas, Plex will oblige.

Instead Roon seems to require a connection, and will say “Poor Conneciton, retry” or something to that effect.

Whyyyy