I’m not sure about the laugh react, since it can be easily abused in cases of strong disagreement.
More generally: low-quality replies can be downvoted, but as I understand, low-quality reactions are given equal weight and visibility. Limiting the available vectors of toxicity may be more generally desirable than increasing the available vectors of light-heartedness.
Reacts can also be downvoted, which results in them being hidden. This is to counter abuse in the same way as voting counters abuse via low-quality comments.
I’m not sure about the laugh react, since it can be easily abused in cases of strong disagreement.
More generally: low-quality replies can be downvoted, but as I understand, low-quality reactions are given equal weight and visibility. Limiting the available vectors of toxicity may be more generally desirable than increasing the available vectors of light-heartedness.
Reacts can also be downvoted, which results in them being hidden. This is to counter abuse in the same way as voting counters abuse via low-quality comments.