We'll see how things pan out, but this might actually make repairs a better experience over time - fewer types of parts means it's easier to keep them in stock, and likely less time required per replacement.
I think this is manufacturing optimisation at the cost of overall life optimisation, like the epoxy-encased batteries which are less recyclable than the previous generation.
That won't be the case with castings, and even less so with Tesla given their approach to third-party repairs.
This will be a nightmare. A damaged fender now means instead of a fender-sized package that easily fits in a truck with lots of other things, you now have a massive half-a-car sized package.
This also doesn't bode well for parts availability in the future. I can't see Tesla switching these massive presses back to producing older designs of panels.