In SO the tags are very useful. But here we have sub forums and search. tags may useful when it is less than 4 characters. Because we cannot search 3 letter words in search. Suppose If I am looking something on RGL or some acronym like pca or mle, I cannot search in this forum ( my understanding is TS search take only the 4+ letter words).
Why there is a limit on tags? I found we can add only three.