It seems super likely that you don't want to click on each track as the prior one finishes so a queue is needed.

It would seem then that playing directly from the library would be functionally identifical to adding everything you click on to a transitory playlist.

In fact you can more or less use it like this with a single playlist that you either clear or just keep adding to.

Seems like that would work better if there was an option to start with a blank playlist or trim the playlist automatically so that only the last x tracks were shown.

What is the difference if any between playing as you say directly from the library and a single transitory playlist.