This is an oversimplification. If the time I'm spending not working is contributing to my ability to make $90/hr it's entirely valid. There are so many things that can fall into this category too, like the need for people to have recreational time, or professional development (e.g. reading journals), etc.

Then you are not making 90$ an hour, but whatever is the prorated fare accounting for your not-billing hours.

I enjoy cooking and baking but even I would say that the only argument needed for "outsourcing your entire meal prep and having food delivered to your house" is "I don't feel like doing it myself."

I'm not posting this just to be a jerk; rather, I think that too often we spend time trying to justify a behavior that is not at all damaging, but somehow seems "bad."

If you don't like doing X and you can afford to pay someone to do it, then go ahead, do so and get on with Life.

I charge my per hour price based on my productivity. So even though its only 8 hours of proudctivity in a day, my effectiveness in that period depends on what i do in my downtime. If i go drinking, my productivity is affected. Same here. Even though it won't be the same price per hour

Whether or not its the amount you get paid per hour, every hour devoted to an activity has an opportunity cost, and there is some value associated with that cost. No time is free.