Goo Truther 
If matrix clients acknowledged new device keys breaking the chain of trust is a fairly normal occurance it'd suck way less. Other encrypted messengers get this, it is a footnote, a little "identity changed" notification if anything. No need to freak out the users about trust over someone losing their old phone.
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Security dorks who don't speak normal can take this as confirmation my new matrix keys are authorized by my old established and verified identity.
