Saying what you need me to say in ways your audience can relate to is numero uno in my book. Which is why I write more like people speak.
Contractions are normal in everyday English. So I use them in your content.
Why say ‘whilst,’ when ‘while’ trips-off the tongue so easily? The same applies to ‘upon’ and ‘on.’
Nothing wrong with the occasional split infinitive. I find them useful for adding emphasis, as are sentences starting with ‘And’ or ‘But.’
Slavishly following old-fashioned rules of grammar doesn’t necessarily make things clearer. Quite the opposite. It can make you appear stuffy & formal.
If it sounds right & reads right, it’s right – even if it’s a one-word sentence. Right!