The main reason for the no-go is that you get hired by HR, not another developer. Many times the company has outsourced the hiring process to another company an

The main reason for the no-go is that you get hired by HR, not another developer. Many times the company has outsourced the hiring process to another company and that one has even less of a clue about programming. So they just read the keywords (or use an AI) to match you. No match, no interview. Ofcourse you can pick up another stack much easier if you already know another. But that is not interesting if all you do is compare number of matches on the CV.