I agree with this, which is why I found it a good moment to ask a bit more about the discipline itself with regards to this thread. I'm suspecting that more peo

I agree with this, which is why I found it a good moment to ask a bit more about the discipline itself with regards to this thread. I'm suspecting that more people disagree than they are commenting here as I'm seeing some downvotes. Unfortunately, they're not participating in the discussion as it would be quite interesting to tease out more why this is or isn't a useful skill. Apparently, opinions on the topic are a bit polarized. Personally, another thing I find it useful for is for salary negotiations when you're talking face to face. Simply being able to guestimate a company's revenue, amount of clients, cost and their mindset gives you an idea if a low ball or high ball offer is due to mindset or due to finances. I find in general that estimations of these types are amazingly good for when you really only have a few seconds, or to warrant further inspection. Like you said, if something is orders of magnitude away, then you already know the answer.