I listen a lot to ambient tracks and I often find that most tracks while quite good tend to end quickly (some for example are 2:30 in length which is very short for ambient) and switch to a wholly new track which is likely to sound different and that kills the flow. I propose that for certain radios (or maybe some custom mode radio) there will be a user-set minimum track length, for example 20 minutes. At the very least shorter tracks should be de-prioritized for certain radio modes: while extremely good for "Discovery" when you're actively looking for new albums, and sort of okay for "New Releases" it's quite bad for everything else.
I can see it being useful for ambient, but it might be also useful for dance tracks when you want to keep the mood stable.