Regarding headphones, this is not an issue once you move into a dedicated office space in your house. One thing I use to hate is taking headphones on/off every time there's a call. Regarding set hours, that's totally a preference. I work late at night sometimes because I feel like it. WFH means flexibility and not commuting means sometimes I get a jolt of inspiration to work off hours. I don't mind because the trade-off is I get to take time off during the day to attend school events for my kids.
Remote work is a lifestyle change for sure. More loneliness, more discipline, less water-cooler gossip. It requires the right mindset and personality that some of you don't have, and I'm sure you're itching to get back to the office.