Having worked at cutting edge biotech,startups and FAANG I wholeheartedly defend the interview process, and believe you would too if you ever switched over for a while
I think there's a certain breed of people who will pony up the time and resources to levelup for the interview, and the compliment. Ignoring the privilege of resource availability, i think its totally doable and worthwhile. I come from a blue collar family and I think my old man would love to hear I can pull off miraculous study habits for a month to take home the kind of paychecks offered for hitting a keyboard.
Granted, if the money were not there, I would not find it worthwhile. I would probably just focus on founding my own company.