Phone screen with HR specialist 1-on-1 phone interview with hiring manager going over resume and qualifications in person panel interview with a tour and questions about the role/technology. offer letter via phone call with HR

I interviewed at the Fort Sask, AB location. First round was a video recorded interview Second round I visited the facility and interviewed with 3 engineers and HR representative Third Round was a site tour The reason for the thumbs down was the HR rep was amazing in the beginning, she was very knowledgeable and would over communicate each step to ensure you knew what to expect as well as follow up with you after each round, the last round was a site tour which was awesome and I was told it was between myself and another candidate, normally you get a courtesy email or phone call stating you did not get the position which I would have expected with the level of communication up until the site tour, I touched base with the HR rep after the site tour to which she told me she would let me know if their decision within 1-2 weeks and complete radio silence.... I sent a follow up email thanking her for her time and expressed my interest and understanding that the final step can take a while, then never heard anything from her. Very unprofessional to not even send a courteous email especially when there is only 2 candidates left.