I wonder, but it could be that some of the hardware they use doesn't offer an open source firmware. Qualcomm for instance isn't super open.

IMO we should put in the law that manufacturers have to mainstream their device and provide a way to flash an updated firmware. There is no way they do it without being forced, because it's a pure source of cost for them.

That's how it works: companies optimise in the legal framework we give them. Regulations set that framework.