One thing I've taken away in my career, interviewing every 3-5 years is that difficulty of interview & difficulty of job are uncorrelated. Often they are inversely correlated.

Possible reasons.. Sometimes a team is growing so fast / or turnover is so high / everyone is so busy / etc that they cannot really stand up a proper interview process .. and/or they just need to get people into seats, and are happy to fire fast later.

Sometimes a job is so boring and team leads have so much time on their hands that they can construct immaculate interview processes and spend hours grilling candidates.