How about this until such time as your feature request is granted? Open the launch SketchUp to the Welcome window and then click on Open file… That way you don’t have to open your default template at all unless you’re going to start a new model
I don’t have many extensions loaded as this is a new build on a new laptop…will try to disable and test a few. All are simple, eg Eneroth Flatten to Plane and Cleanup3. except Vali Instant Road…that’s the “complex” one.