That has been one traditional view. But those early writers that had direct contact with the disciples say that those saints were taken to heaven. They would've had bodies that could face the Father, being the sheave offering of first fruits to the Father. it really isn't that big of a stretch to think so. Enoch and Elijah are there. And they are not there in spirit only. They were taken, and scripture unequivocally states that Elijah was seen going up full body. He even thru his Tallit back to Elisha when he went up.
It is not clear from either the scripture or early writers if these saints included all the OT saints or not. Probably not. There is some allusion in some o the early church writings that Abraham's bosom was taken to heaven at Yeshua's resurrection, but what all that entails is a guess. But they were OT saints. Anything prior to the Passover of Yeshua's death was OT. He only established the New Covenant at the last supper event.
Enoch & Elijah are not there because flesh and blood cannot inherit the kingdom of God. Neither are the O.T. saints in their glorified state when Paul as led by the Holy Spirit had written this;
1 Corinthians 15:50 Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption. 51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed, 52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. 53 For this corruptible must put on incorruption, and this mortal must put on immortality. 54 So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
Jesus also had said...
John 3:12 If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things? 13 And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.
So when the Bible spoke of them being taken to the heavens as in the upper atmosphere, that was not to God's Heaven as in the third heaven.
Where did they go? I suspect that they shall be the actual 2 witnesses at Jerusalem for the duration of the great tribulation. There is precedent for that speculation when after baptizing the Ethiopian eunuch, Philip was transported by the Spirit to another place on earth.
Acts 8:39 And when they were come up out of the water, the Spirit of the Lord caught away Philip, that the eunuch saw him no more: and he went on his way rejoicing. 40 But Philip was found at Azotus: and passing through he preached in all the cities, till he came to Caesarea.
So I believe that both Enoch & Elijah are traveling through time at this moment which to them it may be very quickly to them since they will not have aged for all those years when they arrive in Jerusalem during the great tribulation to serve the Lord as those prophesied two witnesses.