St. Clement of Rome (about A.D. 95) clearly describes the institution of deacons along with that of bishops as being the work of the Apostles themselves (Ep. Clem., xlii).
it should be noted that ancient tradition limited the number of deacons at Rome to seven (Eusebius, Church History VI.43)
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The witness of the Fathers of the Church certainly acknowledges the importance of the diaconal ministry in the early Church. Saint Ignatius of Antioch says that it would be impossible to have the Church without bishops, priests and deacons. He speaks of the deacon sharing in the ministry of Christ. The deacon is a minister of the Church of God. In the Patristic Age the deacon continued to assist the bishop in the administration of the community, performing the sacred rites, and providing charity.
from: https://www.athenaeum.edu/Diaconate/DiaconateHistory.aspx
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It is clear from all traditions of the Church that the role of Deacon was a function that was given to those who had a godly life. They were important believers in early Church communities who served the Lord in this calling to "suffer" to serve others in the body.
Yes, deacons did serve in physical needs but they were qualified and served as those entrusted with the Gospel of Jesus Christ.
Ignatius of Antioch Epistle to the Philadelphians ch 7 [50-117 AD]
"I cried out while I was in your midst, I spoke with a loud voice, the voice of God: 'Give heed to the bishop and the presbytery and the deacons.' Some suspect me of saying this because I had previous knowledge of the division certain persons had caused; but he for whom I am in chains is my witness that I had no knowledge of this from any man. It was the Spirit who kept preaching these words, 'Do nothing without the bishop, keep your body as the temple of God, love unity, flee from divisions, be imitators of Jesus Christ, as he was imitator of the Father'" (Letter to the Philadelphians
Clement of Alexandria The Stromata Book VI ch 13 [150-215 AD]
"Even here in the Church the gradations of bishops, presbyters, and deacons happen to be imitations, in my opinion, of the angelic glory and of that arrangement which, the scriptures say, awaits those who have followed in the footsteps of the apostles and who have lived in complete righteousness according to the gospel"