The Switch Pro Controller is probably the biggest pain in the ass I've ever spent getting a controller up and running on PC.
For starters, a bunch of games initially didn't even detect the right stick for camera control. I still have absolutely zero god damn clue what caused this and what fixed this because the only real thing I did to alleviate this issue is play hot potato with my bluetooth adapter and all my USB ports. After plugging in the adapter into my motherboard USB, it *seemed* to fix the problem for all my USB ports. But I honestly don't know if that was the solution to the issue or if it just started randomly working(Note: Steam also seems to randomly decide sometimes whether or not it detects the Controller when I turn the Controller on with a button press)
The only youtube video I can find that's done any semi-extensive fiddling with the controller on PC
is from this guy who ran into the exact same issue. Difference is, his right stick didn't seem to magically fix itself like mine did, so he resorted to a third party xinput mapper.
The next issue, which the video above also ran into, is that the deadzones on the sticks are kinda fucked. The sticks in general seem to have a smaller throw than something like an Xbox analog stick, so I don't know if it's just the deadzones inherit to the controller or if it's an issue with how Windows is picking up the controller. But what this translates to is that some games, such as Dragon's Dogma, having fucked up left analog stick movement(i.e., You can walk, and I mean
walk, in a 270 degree motion. You can't move immediately behind yourself or back-right and you can't run because the sticks' deadzones don't go far enough for the game to detect a running input) or Mad Max where the right analog stick is messed up(You can move and swivel the camera just fine, but the second you zoom in with a weapon, the camera moves incredibly slow). Some games like Evil Within get the best of both worlds, with the fucked movement of Dragon's Dogma and the fucked up camera controls that crawl across the screen slowly.
Here's a couple of gifs showing off the deadzones between an Xbox controller and the Switch Pro.
Xbox:
Switch:
Note the disparity in the in the deadzones for both sticks. The left analog stick on the Xbox controller moves all the way to the edges of the square vs the Switch Controller. The "bars" on the right analog stick for the Xbox one controller also compress and expand all the way in/out vs the Switch's right analog stick.
Unlike the guy in the video above, I managed to fix this by basically playing multiple games(I had to do this since different games have different tolerances on analog sticks for when a character starts aiming at full speed or moving at full pace) and finding the "sweet spot" using the deadzone reduction options in the Steam controller configurator.
In short, fuckin'...don't use the Pro Controller as your main controller unless you wanna put in some elbow grease.
Edit: Also, understandably no gyro option with the Switch Pro. Probably something Valve would have to outright implement themselves.