That's not true though.

First: things that were done in order to move the blobs out of PureOS weren't hidden in any way, to the contrary - they were loudly announced as "steps towards RYF certification", describing exactly how that's supposed to work in public blog posts[0]. I can't see how that counts as "[users] unaware of the existence of the blobs".

Second: the blobs are perfectly accessible to anyone who wants to study them - not only you can download them from repositories online, but you can even access the flash where they're stored on your device; you can also read and modify the code that loads them. What's more - you can even bypass that loading mechanism and load them directly by yourself from the main CPU if you don't care about keeping the blobs out of your rootfs (and some alternative OSes do that already). Which gets us to...

Third: users do have the ability to replace the blobs. Not only can they run an OS that loads the blobs directly - they can even reflash the storage where the blobs are being stored. And no, no disassembling, special tools or weird hardware tricks are necessary - you can just lift the read-only lock purely in software (it's a one-line change to the device tree), which is there mostly to prevent you from accidentally shooting yourself in the foot than anything else.

You may disagree whether the additional effort that went into creating these solutions was worth it - and that's a valid opinion to have, but nothing's artificially locked out from the user, so nobody is "objectively harmed" by it. That part is just false.

Disclaimer: I work for Purism on the Librem 5.

[0] https://puri.sm/posts/librem5-solving-the-first-fsf-ryf-hurd...