This nuances of the Greek language are important. When we read 2 Thessalonians 3 to be speaking of “idleness,” as in “not-working,” it makes space for poor Christian euphemisms such as, “God helps those who help themselves.” That’s not what the text is saying. A deeper reading is necessary for a faithful understanding.
2 Thessalonians is written to remind us of what matters most: that we hear the words of Christ, that we follow the teachings of the Lord, that we share God’s love with everyone around us, and that we rejoice in all things, for this is the will of God in Christ Jesus for each of us.
To understand Paul’s writings, you have to understand the art of letter writing. Paul wasn’t writing a collection of instruction books for the whole of Christianity, he was writing as an apostolic leader to communities of faith he planted. How we understand his writings will be wholly dependent on how we understand why he wrote.