On top of the myriad of missing features that for example Telegram has, the UI/UX for Signal (at least on the iOS app) is far behind. The app feels laggy and slow in comparison to Telegram or Messages (only other apps I use). It has giant text bubbles with large padding which IMO looks terribly ugly. Also, Telegram now has dark mode which I find very useful. And as mentioned, as silly as gif support is, it's a nice feature to have. If only Telegram used Signal's encryption by default.