I do not share any issues with @Sharon on either Byzantium or Crimson, but my use cases dramatically differ from them. Most of the time, I use Firefox ESR, Secrets, Lollypop, and Shortwave, while fetching SMS every 8-48 hours when appropriate, otherwise I am constantly in Lockdown Mode. I prefer asynchronous communication, so I never initiate or respond to calls on the Librem 5, nor do I use Bluetooth. While Crimson might be acceptable for me, I cannot provide any guarantee whether it will be appropriate for anyone else.