So do modern prophets. They speak from the message of scripture applied to the current situation. They were/are primarily "forth-tellers," not foretellers.
True. In covenant Israel, false prophets were not to be tolerated. In the US, we put them on television.
You misinterpret this verse to claim that John the Baptist was the FINAL prophet, and then you write this:
The only way both of these statements could logically be true would be if Agabus was older than John the Baptist AND the title of FINAL prophet was a matter of one's date of birth, not the end of the prophetic ministry, since John the Baptist was beheaded during the ministry of Jesus.
Of course, if you claim it is birth order, then you have a much bigger problem. You've forgotten about Jesus, fulfilling the role of a prophet, even though you quoted the verses just after this passage:
Deuteronomy 18:15, 18-19
“The Lord your God will raise up for you a prophet like me from among you, from your countrymen; to him you shall listen... I will raise up for them a prophet from among their countrymen like you, and I will put My words in his mouth, and he shall speak to them everything that I command him. And it shall come about that whoever does not listen to My words which he speaks in My name, I Myself will require it of him.
So how do we know that Jesus was this prophet? Because Peter declared Him to be that Prophet in his sermon on Pentecost:
Acts 3:19-26
Therefore repent and return, so that your sins may be wiped away, in order that times of refreshing may come from the presence of the Lord; and that He may send Jesus, the Christ appointed for you, whom heaven must receive until the period of restoration of all things, about which God spoke by the mouths of His holy prophets from ancient times. Moses said, ‘The Lord God will raise up for you a prophet like me from your countrymen; to Him you shall listen regarding everything He says to you. And it shall be that every soul that does not listen to that prophet shall be utterly destroyed from among the people.’ And likewise, all the prophets who have spoken from Samuel and his successors onward, have also announced these days. It is you who are the sons of the prophets and of the covenant which God ordained with your fathers, saying to Abraham, ‘And in your seed all the families of the earth shall be blessed.’ God raised up His Servant for you first, and sent Him to bless you by turning every one of you from your wicked ways.”
Therefore we know that John the Baptist was NOT the final prophet.
Paul indeed teaches that prophecy will one day be done away with (1 Corinthians 13:8), but that will be when the fullness of the Kingdom is complete ("when the perfect comes" 1 Corinthians 13:10), which is characterized by full knowledge of God (1 Corinthians 13:12).
We are not yet at that point.