Completely agree on the hardware part but software should really receive security updates, especially when you're dealing with other people's data as is the case on a phone. Blame the phone vendors that don't have an adequate support plan for their devices. Or the carriers that sell unsustainable phones with their plans.
But Let's Encrypt is really not the one to blame here. They aren't responsible for outdated phones, they aren't responsible for expiring roots and they actually found a solution for these phones (as described in the article).
But Let's Encrypt is really not the one to blame here. They aren't responsible for outdated phones, they aren't responsible for expiring roots and they actually found a solution for these phones (as described in the article).