I think its the law that you have to get a chain that is equal or better than the rest of your groupset. No-one will know that you’re using SLX, you won’t be able to tell, but you will know in you’re heart of hearts that you have done wrong.
Only the 10speed chain is hollowpin, and after years of running other hollowpin chains, I don’t see what is not to trust.
The nickel coating on the XTR chain makes a big difference to the durability of the chain. It is very resistant to surface rust (if you leave it wet overnight etc). I recently shortened an XTR chain I’d used for a few months, and took the chance to look at the wear between the inner and outer plates; the nickel coating was still intact.