No? If anything, the frequent typing of text on phone keyboards in online interactions has created even more intricacies to language; as now we are used to not only using the proper methods of capitalisation and punctuation marks to convey meaning, but also to intentionally leaving them out or distorting them to convey more meaning or emotion. Phone keyboards can auto correct, auto capitalise and add punctuation to sentences for you. People go out of their way to disable those and intentionally type “incorrect” sentences because “On my way!” vs “on my way”/“omw” just don’t feel the same.

Also, not bothering to type “proper” sentences while texting your friends on a phone keyboard doesnt mean you start to just forget that sentences begin with a capitalised letter and end with a dot lol. Furthermore English is just a stupid language with stupid spelling and pronunciation rules. The concept of the spelling bee was really shocking to me when I first heard about it as a non-native speaker becuase most other languages just… are easier with spelling.

edit: some people really are just basically illiterate though (see what I did there? no capitalisation.)