The auto-start of the user service stating with Trixie has the side effect of blocking the ALSA output card/mixer on the sytems where there's no DMIX available for ALSA - i.e. Raspberry Pi with HDMI output.
Another issue - the package is pulled by installing the libfluidsynth3-dev package and this leads to a prioblem when a user tries to use just the Fluidsynth libraries (i.e. compile dsda-doom, ScummVM, Dosbox, etc). The dependency on the fluidsynth package for the dev libraries leads to the auto-start of the service, even if the user hasn't asked for it.
Please re-consider the auto-start of the user service by default or - pertaining to the 2nd point above - don't add a hard depenency to it for the libraries/dev packages.
thank you,
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Cristi Mitrana