If you want to save a photo, right click on it and save link as or whatever your preferred browser says. or you could drag it to the blank spot next to your dock. Maximizing a window doesn't make you some sort of 'square'. Ask photoshop or FCP or Illustrator users if they maximize, i bet most do. when working on 1 big project, you need 1 big window. in essence, if you have a desk, you'd clear it off completely so you can spread out your big project on it. that's what people do when they're focused on one project, it's like using a drafting table. and if you need to quickly switch between maximized windows, macOS has this lovely function called expose which is perfect for the task.
I'm male and don't multitask well. in fact, studies have consistently shown that when multitasking people are less productive. Many people need to multitask to accomplish their tasks, but for the most part I do not. I focus on one task until it's finished or the clock strikes 5 (we're getting close here on the east coast, thankfully...).
Overall no, fit to content isn't broken, it's a great feature. many users would just like to see a maximize command and perhaps some 'arrange windows' commands wouldn't hurt either. i like having 2 windows next to each other, but arranging them without wasting space (for me it's almost ocd, that one line of background pixels will distract me) is tedious.
