I am very privacy conscious, and I don't use a smartphone, at all, because it's basically a spying device in your pocket.
Why Signal is all about privacy and then it forces me to pair it with a telephone?
Telegram desktop is really standalone. They require a telephone number too (and that's very annoying), but they don't require having a smartphone or keeping your phone open. My phone number on telegram is not even my phone number anymore, and it doesn't make any difference... Privacy wise is far from being perfect, but it's already better. At least it's usable.