Apple Software Developer interview questions

Frustating experience: got contacted by hiring manager , the recruiter took more than one month to get back, then planned 6 rounds of interview, very less accommodative with change of dates for the interview. Interviewer asked very casual current job related questions, no technical questions regarding DSA or other CS topics, next week recruiter sent rejection stating that my skills not meet the job requirements, if this were the case, why was I contacted at first place. Very bad experience.