I don't know which devices you have used, but that's simply not true in my experience. Mind you, I have sworn off Samsung, since their TouchWiz has indeed bee

I don't know which devices you have used, but that's simply not true in my experience. Mind you, I have sworn off Samsung, since their TouchWiz has indeed been a laggy mess in the past. But in my experience over the years with HTC, Sony, Moto, or most recently Nokia, text input is fine. (And definitely less laggy than on my - admittedly old - iPad 3.)