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