The games aren't "preloaded"....there are shortcuts to them on the start menu that allow you to install them. You can simply right-click the tiles and unpin them from the start menu.
The audio input issue is causing by Windows trying to guess what input you want to use. If you left-click the speaker icon (next to the clock), you can choose a drop-down menu of what audio device you want to play. I switch between speakers, a BT earpiece, and a soundbar a lot and don't seem to have any issues.
Honestly the mere presence of the games in the Start Menu on a "Professional" operating system is a problem for me. For extra fun, there's a bug with at least the current version of Win10 where depending on your system clock's settings when you install it (for example having your system clock set to UTC), you aren't allowed to make any changes to the Start Menu until your system clock wraps back around to the local time it would have been when you installed it. That was a heck of a bug to figure out.
As for the audio thing, it's definitely a bug. Yes, you can select the output that way, but Windows 10 will, seemingly randomly, decide to direct the output to another device. It can be fixed by reselecting the correct output, but it will even go so far as to create copies (not re-enable) disabled audio outputs when it decides it wants to use something other than what you had selected when last you booted. Hopefully this gets fixed soon. It's happened on every multi-sound-output capable Windows 10 computer I've had.
They also made it hard to use Windows Picture Viewer, but it's possible through a registry hack.
I will say that once it's up and running, it's not a bad experience sans the sound output thing.