it is a development machine with highly specialised tools - Altium Designer, SolidWorks, IDA Pro, Altera Quartus, etc.
Upgrading the OS is not a trivial thing as would be on a phone or tablet. Also when upgrading the OS it would make sense to upgrade the HW as well, and that is a major investment. And Signal is just not important really to warrant that.
I would still use it on my phone though, but on the PC is just Viber unfortunately (whatsapp dropped as well).
it is a development machine with highly specialised tools - Altium Designer, SolidWorks, IDA Pro, Altera Quartus, etc.
Upgrading the OS is not a trivial thing as would be on a phone or tablet. Also when upgrading the OS it would make sense to upgrade the HW as well, and that is a major investment. And Signal is just not important really to warrant that.
I would still use it on my phone though, but on the PC is just Viber unfortunately (whatsapp dropped as well).