I’m very very disappointed about this too. Found out about it as I started to play MLB The Show 21 on my PS5 at launch time, flash drive full of music in hand, all ready to go. Wow, what a letdown. 
Importing my own music into SOTS and listening to it while playing the game was an integral part of my MLB The Show experience in past years. I don’t understand why it wasn’t possible on the PS5. I suppose there must have been a reason. I’m wondering if there is a chance it will be reinstated?
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NapoleonSoloXP_MLBTS
@NapoleonSoloXP_MLBTS
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Sounds of the Show 21