Memory palace without imagery

Hey guys, this interesting question has been on my mind for a few days that is If one creates a memory palace by directly putting the information in a specific loci will one be able to memorise it better compared to random forced or repeated memorisation.

Although I know this Idea is not quite efficient but there are thing to memorise which are hard to make images of or one is actually short of time to create a image for each data.

For example in the given link the person memorised 200 equations without making images so I just want to know it works or not.

Memorising 180+ physics equations

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But isn’t it one of the similar ways flashcards work, One memorises through flashcards through repetition and revising thus if one given a choice between flashcards or an non imagery memory palace, which one is better?

Also is there any alternative method (not types like software,paper etc. ) for flashcards which takes the advantage of spaced repetition in the same way?