Boston Consulting Group Marketing-Manager interview questions

Great screening call with Talent Acquisitions (kept me informed through the process and was very helpful throughout). The 1st-round and 2nd-round interviews went smoothly, and then... ghosted for over a month and a half. I understand moving on with other candidates. It's part of the process. However, please notify people within a reasonable timeframe. Ghosting people isn't okay in personal relationships; why on earth would it be okay in a professional setting at such a prestigious company?