There are a couple of points that I'd like to make:
First, concerning the requirement and practice of interpretation: Is it a requirement if everyone present has the gift? Paul discussed "If an unbeliever or ungifted man enters".
So when I am with a group of intercessors in a closed environment, so that others are not going to show up, there is not requirement. Paul was discussing the practice in what might be considered a regular church service, when God might bring those who do not yet believe nor have been gifted.
Second, Who should have the interpretation? Paul explained that the person speaking in tongues should pray for the interpretation!! Most churches I have gone to do not line up with Paul's thinking!! Most of the preaching I have heard expressed the idea that the person speaking in tongues is not supposed to be the person that has the interpretation, which is opposite of the idea that the person speaking should be the one praying for the interpretation.
1 Cor 14:13 Therefore let one who speaks in a tongue pray that he may interpret.
Third, I believe there is a connection between the account of Babel in the Old Testiment and the Spirit coming like tongues of fire and the devote men hearing and understanding what others were speaking in tongues on the day of Pentecost. That is, God mixed up the languages of people at Babel because He said that if they worked together building a tower to heaven, nothing would be impossible. Then later God gives the people a language in which they all can speak and hear in their own language. So now, if we all get the gift of tongues and the gift of interpretation, so that we can all now speak the same spiritual language and hear what the Spirit is saying in a language we understand, all now is possible through the gifting of God, like when God came down and saw the people building a tower to heaven! We now have that tower (spiritually speaking) which gives us access to heaven via the language of angels!
Which bring me to the fourth point: During the day of Pentecost, all the devote men recieved the out pouring of the Holy Spirit, but there were others who scoffed and said they were drunk!! There is much written against scoffers! Prov 14:6 A scoffer seeks wisdom and fonds none.
If a person is going to be critical of the gifts of God, why should He pour out His Holy Spirit on them?
If you say to yourself, 'I don't know about the gift of tongues', should you not seek God for what He knows, or should you listen to someone like yourself who admits he does not know? And if you speak against the gifts of God, havn't you spoken against God? That is what a scoffer does. He speaks against his creator and finds no fault with himself.
Now what gets me is that; over and over I see people behind a podium down playing the gifts of God. Even many if not most of those who have the giftings of God usually down play the value of those gifts!! They present the gifts as if they might be a nice novalty item to ask for if you think you might want it. And people doing that tell others they are Charismatic? Are they really Charismatic or they half hearted followers of God? Paul was not like that! He twice wrote forcefully, "Earnest desire the Gifts" and "Now I wish that you all spoke in tongues". But all too often we don't tell people to earnest desire the gift, and it seem our wish is not concerned with them all speaking in tongues.
1 Cor 14:1 Pursue love, yet desire earnesly spiritual gifts..
1 Cor 14:39 Therefore, my brethren desire earnestly to prophesy, and do not forbid to speak in tongues.
And Paul also wrote 1 Cor 14:37 If anyone thinks he is a prophet or spiritual, let him recognize that the things which I write to you are the Lord's commandment.
So my friends, desiring the spiritual gifts is the Lord's commandment!! We need to recognize that!!