Two-in-one PCs have come a long way since the 2012 launch of Windows 8, which was optimized for touch devices. But there are still plenty of skeptics who see them as laptops with a touchscreen they won’t use or tablets that disappoint as laptops.  Frankly, that’s totally understandable. It wasn’t until I started using a convertible everyday — one with the display permanently attached to the keyboard — that I realized more of the design’s advantages over having just a laptop.  Even if you’re not a regular tablet user, there are other ways to put the touchscreen to good use thanks to 360-degree hinges used to flip the keyboard around. Once you stop thinking of it as a laptop or tablet and start using the in-between positions, usually called tent and presentation or display modes, that the flexibility of the design pays off.  The keyboard and touchpad on my two-in-one are good, but when I’m at my desk I’d much rather work with a full-size keyboard and mouse. Do this with a regular laptop and you’ll end up pretty far away from your screen.  With a two-in-one, though, you can flip its keyboard under and slide your larger key...