The whole concept of salaried roles is that you're being paid to achieve enough to keep your employer happy. If my boss feels like he's getting his money's worth based on my output, it really shouldn't be anybody's business whether I'm achieving that in 3 hours or 12 hours. In fact, if I can produce a satisfactory work output in 3 hours versus somebody else's 8, then I'm not shirking at all, I'm simply better at my job.
And as a knowledge worker, I'm being paid to solve problems, and have and structure the knowledge to solve problems in the future. If I'm solving problems for work in the shower, or on my way to lunch, or while making coffee in the morning, I'm literally being paid to do my job. As a software developer not responsible for operations, literally nothing in my job can't wait 30 minutes. Even if I was at my computer, actively coding, it would probably take around that long for me to get to an appropriate stopping point to respond to a message.
And as a knowledge worker, I'm being paid to solve problems, and have and structure the knowledge to solve problems in the future. If I'm solving problems for work in the shower, or on my way to lunch, or while making coffee in the morning, I'm literally being paid to do my job. As a software developer not responsible for operations, literally nothing in my job can't wait 30 minutes. Even if I was at my computer, actively coding, it would probably take around that long for me to get to an appropriate stopping point to respond to a message.