YMMV but I was using phones of this type https://store.planetcom.co.uk/products/astro-slide https://store.planetcom.co.uk/products/astro-slide with a slideout k

YMMV but I was using phones of this type https://store.planetcom.co.uk/products/astro-slide https://store.planetcom.co.uk/products/astro-slide with a slideout keboard for quite a while some years ago. It was not that I could type faster (a swipe style onscreen keyboard is faster than all non full QWERTY keyboards IMHO) but that when I was writing a lot, long text or terminal command it was much more comfortable.