Unfortunately, that's true. For now. But as the technology matures and Tesla learns what the points of failure are, we'll see these items get drastically more reliable in the future.
Well, yes, and no. The current parts will undoubtedly get more reliable, but I'm sure they'll be adding or replacing with new parts continuously to keep up with advancement in technology and changing consumer demands. As such, there will always be new and relatively untested parts in cars.
Let's just call your view here unreasonably optimistic. It's a car, it has a service life, that service life is never going to be 500K much less 1m. On average people do not want to keep a car all that long anyway.
Seats rip, carpet wears out, road dirt etches and clouds the windows, the whole car would be replaced piece by piece anyway. Think with your head not Tesla goggles.
Heck those of us with 5+ yo car have had the function of our batteries badly handicapped without explanation.
I think the 1 million mile motor, if achieved, will mostly be useful in future Semis and robotaxis.