Is space gray really that bad in the long term? I just bought the 2019 13 inch SG, since I don‘t like how the keyboard and TB look compared to the body (too dark imo).
Some folks will disagree that space grey won't last as long as silver, but it is true that anodized coating will thin out over time. Anodized coating is subject to wear and tear. I have fountain pens that are 10 years old that are brushed titanium that look as good as new.
I also have newer fountain pens that are anodized in black on aluminium and the threads of the barrels have already worn off and are showing bare aluminium underneath due to constant abrasions closing and opening over the years.
If you upgrade your macbooks every 2-3 years, I don't think it's a big of a deal but I use my laptop for 5+ years, so durability of the finish matters to me.
Anodized coating is still mainstream compared to dlc coating. If macbooks had dlc coating, I'd buy space grey in a heartbeat but I'm guessing apple didn't opt for it due to cost concerns.