I've tried this several times and I always forget I've got a notebook and a pen.

Or I have the pen upside down in my pocket and it leaks and I get a blue bit on my leg.

Why take up valuable pocket/bag space with a notebook, when you already carry a phone with you everywhere?

I utilize the built-in Notes and To-Do apps on my phone daily; they're very useful for remembering things. No clunky notepad needed.

There's also Habitica if you want to make remembering things feel like you're doing quests in a video game.

On the one hand, completely agree. On the other hand, this would only work for me if I kept one notebook for writing and one for doodling, because the instant I'm done writing, that page is filled with random little lines and swirls and drawings.