Lenormand and tarot are not the same grammar
Two systems, two units of meaning
Tarot’s unit of meaning is the card. A single tarot card carries enough interpretive material to sustain a reading on its own, which is why one-card draws are viable and why tarot literature is organised as 78 essays.
Lenormand’s unit of meaning is the pair. A single Lenormand card carries a narrow, largely fixed sense — Scythe cuts, Mice erode, Ship travels — and almost nothing else. One-card Lenormand draws are close to useless, and Lenormand literature is properly organised as a table of combinations.
What transfers badly
Readers arriving from tarot over-interpret. They read Coffin as a dark night of the soul rather than as an ending with a body to dispose of, and Snake as shadow work rather than as a specific complication, usually a person.
Readers arriving from Lenormand under-read. They treat the Major Arcana as fixed keywords and lose the symbolic layer that tarot depends on, producing readings that are precise and thin.
The mistake is not using both systems. The mistake is using one grammar on the other’s vocabulary.
Facing has no tarot equivalent
Most Lenormand cards contain a figure or object with a direction, and that direction determines which neighbours it acts upon. Tarot has no comparable mechanism — a reversed tarot card modifies its own meaning, it does not point at another card. Attempting to import facing into tarot produces rules that cannot be checked; attempting to ignore it in Lenormand discards roughly a third of the available information.
Practical consequence
Keep separate notebooks. Practitioners who log both systems in one journal reliably start describing Lenormand pairs in tarot’s register within a few months.
When to use which
Use tarot for questions about condition, motive, and interior state. Use Lenormand for questions about sequence, agent, and outcome. The systems are not competing accounts of the same thing; they answer different question types, and choosing correctly is most of the skill.