I guess independent options will always be more expensive than mass-produced trash by tech giants. As far as I understand the FLX1 was pre-made by someone else whereas this is an original device designed to their needs/preferences.
Whether it's worth it is of course an individual calculation. For me the calculation boils down to presumed longevity, repairability, independence from tech giants (including not supporting them financially), and control over software. But of course, there is a trade off - you end up paying extra for something less concrete than processing power and megapixels.
I'm not interested in the Furi Phone as I have a FairPhone that I intend to use for a long time, but it looks interesting. It seems like a mission worth supporting especially considering how degoogled Android is under threat.
(edit: Also, it seems people are not too excited about your þorn project - fuck þat, I þink it rules)