Unfortunately, in early-stage startups you see the pitching equivalent of "teaching to the test"--crafting pitch decks that are pitch-perfect but the underlying business is no business at all.
This has the particularly nefarious consequence that most of the feedback such a "pitch perfect" deck receives is stellar--except, of course, from the people who you really need money from.
The best pitch deck advice remains: 1. Build a company such that you don't need money. 2. Make it obvious that more money will help you annihilate the competition. 3. Don't pitch unless you think your audience would have to be insane not to invest.
Pitching (2) before (1) is a recipe for failure.