I’ve used a lot of tools over the years, which means I’ve seen a lot of tools hit a plateau. That’s not always a problem; sometimes something is just “done” and won’t need any changes. Often, though, it’s a sign of what’s coming. Every now and then, something will pull back out of it and start improving again, but it’s often an early sign of long-term decline. I can’t always tell if something’s just coasting along or if it’s actually started to get worse; it’s easy to be the boiling frog. That c...