I feel this is a very stupid move: it is probably true security is harder to guarantee with old devices, but whatsapp/telegram support them without problem, and the "durability" aspect should count for something in their decision-process…
What do people around here recommend doing? Taking the networking effect into account, pushing people to something like matrix will probably be quite hard…
What wouldn't make sense would be to spend resources to continue supporting an unsupported operating system with an imperceptible market share.
The iphone 6 had a good run (2014-2023), but it's time to upgrade.
I think the idea that matrix will solve your problems is not very well thought out. If anything supporting effectively deprecated devices is a poor security stance. Matrix, from what I can tell, is complicated and complexity is the opposite of security.
I know I am not going to make you feel unreasonable by saying this, but I think you are being unreasonable.
Upgrade your phone, get an Android, stop using Signal. I think that covers your options.