I don't have any problem with signs in the 1st century and so i'm not wrong thus far.
Even that passage is against the idea of today's self appointed preachers and tongue speakers and miracle workers.
Luke 10:
1After this, the Lord appointed seventy-two
a others and sent them two by two ahead of Him to every town and place He was about to visit.
2And He told them, “The harvest is plentiful, but the workers are few. Ask the Lord of the harvest, therefore, to send out workers into His harvest.
3Go! I am sending you out like lambs among wolves.
4Carry no purse or bag or sandals. Do not greet anyone along the road.
......
16Whoever listens to you listens to Me; whoever rejects you rejects Me; and whoever rejects Me rejects the One who sent Me.”
The word of God is God and the gospel is only preached by God and God through the ones He has physically appointed and no one else. The reason Paul says:
Heb 2:
1We must pay the most careful attention, therefore, to what we have heard, so that we do not drift away.
2For since the message spoken through angels was binding, and every violation and disobedience received its just punishment,
3how shall we escape if we ignore so great a salvation?
This salvation, which was first announced by the Lord, was confirmed to us by those who heard him. 4God also testified to it by signs, wonders and various miracles, and by gifts of the Holy Spirit distributed according to his will.
The gifts were for the 1st century church who were appointed by God to preach the gospel and the gifts were to confirm the word of God. They were not given powers to appoint others after them in an endless cascade and there's a reason for that- all of them were appointed to die for the sake of the gospel. Only through their death was the gospel passed to their listeners.
None of these things was to be carried over to the 2nd century going forward. meaning that from that point, people have appointed themselves against God.
There are no genuine gifts today- i'm not saying there's no healing or prophesy or teaching today, but all these is within those that believe. I need a healing, i'll get it with no specific person laying hands on me, i need understanding, i get it straight away from the scripture with no one telling this or that.