Meaning is broader than 'oneself'
Recognise a family of reflexive, reciprocal, middle, passive-like, and lexical meanings.
Many -ся verbs cannot be translated with English 'oneself'. Treat the postfix as part of several related valency-changing and lexical patterns.
- Self-directed action is only one possibility.
- Some verbs express mutual action.
- Some express state, spontaneous change, or a lexicalised meaning.
Mini-check