Rubberized Messadging texture on Mouse and Keyboard

I was wondering why there are not that many Mouse or keyboards with a texture, made of rubber or something that messages you hand and stuff!, i have actually not seen one, in my mind it would seem that it would be nice to have that, especially on the buttons, could it delay reaction time? is there another reason? and is there any mouse or keyboard models with a special texture on them that is very comfortable?

The reason for this In my opinion anyway is after a while with massaging bumps and stuff eventual it rubs you hand raw or makes it go numb both of thies things are bad for gaming and would delay reaction time and hurt

You have a point good Sir!

I could see it getting annoying!

Could see that getting messy and holding lots of bacteria and such, especially if it is a soft rubber texture with lots of little bumps imo