Tone Indicators

What are your opinions on tone indicators? Do you support the use of tone indicators or do you think they're unnecessary?

Tone Indicators if your wondering:

/j (when you're joking about something)
/hj (half-joking)
/s (sarcasm)
/srs (serious)
/p (platonic)
/r (romantic)
/nc or /neg (negative connotation)
/pc or /pos (positive connotation)
/lh (light hearted)
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There's more but it'll probably bore you to death.