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> Hence, it is recommended to use HASH data structure and also, RedisJSON module.

There's a catch. HASH data structure saves everything as STRING. Your {"count": 1} would turn into {"count": "1"}

> Hence, it is recommended to use a SORTED SET

SORTED SET will eventually leads to "Large databases running on a single shard"

Eh, I use hincrby and hincrbyfloat to increment an integer in a hash..

I think the point was that you lose the type information provided by JSON when you store the data in a hash. There is no way to tell the difference between a string "1" and an integer 1 when stored as values in a Redis Hash, since the integer will be converted to a string.

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