For the record, the "jail" only exists so PureOS (or any other distro) does not have to distribute any blobs within its repositories or include them in their images - though distros still can if they choose to, like postmarketOS does for example. There's very little difference between a firmware blob that's stored in a peripheral's internal flash, NOR flash or OS rootfs when it comes to user freedom, in the end it gets executed the same way on the same hardware. Having a separate place for these blobs only simplifies their management and allows to put a clear distinction of what's free and what's not. The important thing is that, regardless of whether the "jail" is used or not, there's not a single blob that runs on the user's CPU within the user's system on the Librem 5, which isn't a unique property for a phone but rare nevertheless; the peripherals are a different thing and Purism has never claimed that there are no blobs there (in fact, the existence of e.g. the DDRC blob was being highlighted already in very early development).

(also, the NOR flash itself already had to be there because that's what TPS65982 boots from, so the "jail" is just using the 4MB storage that would otherwise remain mostly empty)