i wouldn't forbid anyone, but counsel a better thing:
Therefore, one who speaks in a tongue should pray that he may interpret. For if I pray in a tongue, my spirit prays but my mind is unfruitful. What am I to do? I will pray with my spirit, but I will pray with my mind also; I will sing praise with my spirit, but I will sing with my mind also.
(1 Corinthians 14:13-15)
what use is it to desire to speak or pray what no one can understand? so i'm not trying to dissuade anyone from the gifts, but i do think there are places where it's not the spirit, but the tongue, that's desired, and a spirit that isn't the spirit of truth is celebrated.
The eight-fold reasons God gave us tongues are ALL vey useful.
The tongues that speak mysteries, are useful, Because as we speak in tongues, our spirit is sensitive to the Spirit of God, And He can show us the mysteries.
The tongues that build us up, are useful, because they do what it says, "Build us up".
The tongues that are our spirit pray language, are useful, because it's our spirit praying for what our minds can't think about.
Tongues are useful, because the devil can't intercept our prayers.
Tongues of Angels are useful, because God can use them to help us bind the devil, and the devil being a fallen angel, will be able to understand the tongues of Angels.
Tongues that the Holy Spirit uses to intercede for us, and through us for other people, or some circumstance, are useful, because God uses then so all things work together for our good, Or the good of others.
Tongues that are a foreign language, are useful, Because God can use us to speak to a foreigner.
Tongues that need an interpretation, are useful, because they edify the Church.