Pros
Not all senior people are criminals, some are just bad mentors. It doesn't count as slacking if you watch live sports off a big TV screen while working from the desk. But oh you cannot speak with a colleague in the pantry for more than 5 mins. You can take a sick leave if you are not well but you are still expected to work because you are not really sick all 24 hrs in a day.
Cons
Fake Discipline - I was working on alpha research, I was not managing a live trade, I would reach office between 9 and 9:30 am. My mentor would reach office at 11 am and give me a lecture on discipline. Dumb money - I was just one month into the job, I had a steep learning curve until one day my mentor told me how he could save time and money by doing the work all by himself and finishing the project sooner and taking the strategy live earlier. He could actually do it because he used to get 25hrs in a day. Anyway, I never asked him any questions again. So much for growth. Inhumane people - I had gotten covid and had taken sick leave. I was expected to work but I did not because um I could not because I was really sick. As soon as I recovered and got back to work, my mentor asked the HR to ask me for a voluntary resignation :) I had a traumatising experience in the very toxic environment