The Alternative Luke made it very clear that verses 22-34 were addressed not to the crowd but to the disciples. There is an implication here that worry is one of the besetting sins of Christ-followers. The reason is not hard to discover. The terms of discipleship are demanding.
Financial questions loom large.
My head assures me that He will, but my heart is not quite so certain. Physically, this is so. As someone has observed, people get ulcers not so much from what they eat as from what eats them. Anxiety also steals emotional peace and removes spiritual assurance. Telling us not to worry isn't very helpful.