Some folks have an idea that apostleship died out in the first century; that it was just the Twelve, and no more. This is a theologically convenient (for some) stance that has no basis in exegetical reality. The attempt to limit apostleship to the Twelve by appealing to Acts 1:21-22 fails because of Acts 14:4,14, Gal. 1:19, 2 Cor 8:23, and (arguably) Rom. 16:17. The mere existence of Barnabas, James the brother of Jesus, and especially Titus as apostles is enough to blow the whole thing wide open: it’s plainly more than just the Twelve. Once we know that, we don’t have to resort to tortured explanations of passages like 1 Cor. 9:2 and Rev. 2:2, and those passages begin to make a whole lot more sense.
The broader usage gives us a hint at what apostleship looks like beyond the Twelve, and Paul gives us another one in Rom. 15:23. Paul says there’s no longer room for him to minister where he is. What is it that there is no longer room for? Certainly there are plenty of unbelievers to evangelize and plenty of believers to disciple. He’s an apostle, which is to say a spiritual arsonist. He gets the fire started; once it grows to a certain point, he hands it off to others to feed, and he moves on to start another one.
We still need those people today; they’re the ones that start new works of all kinds. Might as well give them the right name, and acknowledge their spiritual gift for what it is.