This also means I might finally have an answer to the age-long question: what phone should I get next. The answer seems to be: something modern that supports #SailfishOS.
I had two reasons to consider jumping ship from Sailfish:
1. Signal only available as an Android app, with Android emulation causing it not to work all that great;
2. lack of full memory encryption.
Whisperfish solves 1.; and next releases of SailfishOS supposedly will solve 2.: https://blog.jolla.com/sailfish3/