No, from my personal private POV (and my Win10 Pro 1703) I can't confirm this behavior:
- You can't create pure local event in Calendar App (if you have linked some external calendars): you must to select (one) linked calendar from list
- Created event will appear in this remote calendar (maybe not immediately, but after scheduled sync - I didn't test it yet) and in local calendar (in app)
And yes, you will have troubles with syncing of calendars, but in slightly different style, if you have more than 1 external calendar and these calendars can't synchronize data among themselves... but this is an another story about sitting on a set of chairs and incompatible tools
Do you want to see screenshots from my side and|or some shared tests is RW-shared Google Calendar?