Christians overthink themselves and their church. Too many times people talk about getting out of the 4 walls and do something. What is doing something? Missionary work? Isn't living your life, using your sphere of daily living to inject the gospel of Jesus part of getting out of the church thing and doing something?
I do agree with you. However why say missionary work is wrong? or anything else is wrong? is it the thing that is wrong? or that Christ is not being glorified in it? If you tell a young person you can't be a missionary, and that is the exact thing God called them to be? Who are you sinning against? How many told Amy Carmichael not to go to Japan or India, because she was too frail or too weak, in her current state to do so?
If she would have turned back, oh my!
Should everyone be a missionary, absolutely not!
1Co 12:27 Now ye are the body of Christ, and members in particular.
1Co 12:28 And God hath set some in the church, first apostles, secondarily prophets, thirdly teachers, after that miracles, then gifts of healings, helps, governments, diversities of tongues.
1Co 12:29 Are all apostles? are all prophets? are all teachers? are all workers of miracles?
1Co 12:30 Have all the gifts of healing? do all speak with tongues? do all interpret?
1Co 12:31 But covet earnestly the best gifts: and yet shew I unto you a more excellent way.