- "in
deducing the use of handwriting" - sounds a little awkward. Maybe this is better: "in
reducing the use of handwriting."
- "some researchers
have proven"...
Regarding the contextual aspects of your essay:
- pain and handwriting -- it's not a very persuasive point (a counter point could be that handwriting promotes better arm muscles + typing on a smartphone is probably more painful if we talk about pain).
- "low standard people" -- it's confusing what you mean (even if someone cannot afford to buy an electronic device it doesn't make them "low standard)
You could devote a paragraph to 'voice to text' solutions / technology (when you say words to a microphone and they are being automatically translated into electronic text). You could also strengthen your argument that using handwriting is important by referring to research that proves that people who use handwriting may "exercise" parts of their brains that normally don't work when using electronic keyboards only.