Why is it difficult to recruit experienced designers for electromechanical (water supply and drainage, HVAC, electrical) majors now? Where did everyone go?

How difficult is it? Most of us still want to go to the design institute, and it is still difficult for us to find a job here urgently. Unfortunately, we are not 2 1 1 college students who just graduated and don't want to come. Where can I find experience? This is a difficult start. A few years ago, who looked down on a design institute with several years of experience? It is said that college students are more competent than experts, so it is true that the enterprise has 5~ 10 years of work experience, and only a few registered engineers and national registered people want to maximize their interests, which also causes an important reason for frequent job-hopping in the industry and has no sense of corporate identity!