You don't need primary selection to avoid the keyboard, you can also hold right-click on your selection and release it on "copy" (or right-click on your selection then left-click on copy, more intuitive but slightly more cumbersome)
I agree it's less convenient (there's an extra step: explicitly copying the text), but in my experience it's also more reliable as you don't lose it by just selecting anything.
You don't need primary selection to avoid the keyboard, you can also hold right-click on your selection and release it on "copy" (or right-click on your selection then left-click on copy, more intuitive but slightly more cumbersome)
I agree it's less convenient (there's an extra step: explicitly copying the text), but in my experience it's also more reliable as you don't lose it by just selecting anything.