The purpose of a pitch deck is to get a meeting with an investor or one of their lackeys.
To receive investment, you have to get a meeting. To get a meeting, you must follow the rules and stand out.
Investors read hundreds, if not a thousand or more, pitch decks per year. To get through them, they will spend about two minutes on your deck. They just want to hear the story.
Getting your crappy pitch deck into shape can be a challenge. I often coach founders to start with a blank slate to get insight into how their story could be better.