STR interview questions

Really unprofessional process. I talked with a recruiter via email to set up an interview. Recruiters response time was terrible, which is understandable if they are really busy. However, what I found to be really unprofessional was the lack of follow up after the interview. The first interview was with the hiring manager. It was low pressure and professional. I thought it went well. He told me I’d hear back in between 1-3 weeks. I followed up after 1 week, was told they were still deciding. I then followed up after 3 weeks and never heard back. If I take the time to prepare an application and prepare for an interview, then the company should at least give me the courtesy of a follow up with a yes/no decision.