Congrats on your new acquisition. May it serve you well. Nice, clear photos. Thank you for that.
If I may say, nothing wrong with MIM parts. I doubt you'll ever need to replace the extractor. Unless, like every other metal imperfections, is a bad casting, or something.
As an example, I pulled all the MIM parts off one of the first TRP's the Springfield Custom shop produced, but the extractor as a test. Thousands of rounds later it hasn't broken off. Still in the gun. It doesn't keep its tension as a tool steel extractor does, but it hasn't worn, chipped, or otherwise. Easy enough to bend it back into shape with the right tool anyway.
I think the negative stigma that follows MIM parts around comes from the fact that people have a hard time accepting a substitute for something that didn't need fixing. MIM parts are cheaper to produce and allows manufacturers to sell more, economical guns with a cheaper price tag.