Yes. I used to drop files in a directory and they would be transferred to my phone with Syncthing, then I would listen to them using an audiobook listener app that had all the properties I wanted from an audio player.

Then I found out that AntennaPod has all these same properties and it's cheaper, faster, leaner, prettier, and the fact that it fetches the episodes automatically for me is good, not bad as I originally thought. Also having each episode metadata and just having them organized overall is really good.