a lot of styles teach 'basics'. even in aikido, you have kihon waza, or even more basic than that, you have kihon dosa, and tai sabaki etc. in other budo, you have basic kata. these things are all there to provide the key blocks to movements and techniques.
in Systema, there are no such building blocks. this is because the blocks are infinitely smaller! using japanese budo as a reference point, the kihon movements are like LEGO blocks yeah? some big, some small, some rectangular, some square etc. with those, you can build whatever you want... within the parameters of those said blocks.
Systema however, is like learning to build with sand. the opportunities that present themselves with the significantly smaller base units allow for crazy, unorthodox movements that seem to be impossible or impractical, yet functional and effective. well, potentially anyway.
that's why Vladimir always talks about being free. you don't learn to fight in Systema. you learn how to move. once you (re-)learn how to move freely, you can do any bloody thing you want--including to fight if that is what you want.