It sounds like you think the painting's age means that it no longer has power, or at least, not power enough to warrant a content-warning. I would beg to differ, and argue that the fact that it still has the power to shock is what makes it "world-renowned".
Personally a mixture of the two suits me best. I appreciate the time by myself, but every now and then I want to go into the office to reconnect with other people. It can also make rubber-ducking more efficient if said duck is sitting next to you.
> 99designs output is literally just an image of what they think your website should look like. Actually writing all of the HTML and CSS to make it actually look like that is up to you. It makes me think, why am I paying money for a picture of what my site could look like that requires me to do all of the actual work?
This implies that design is not work. Strange, on a tech website, to encounter someone who doesn't realize that design and implementation are two separate jobs.