Many crashes happen when newbies get on the brakes when they shouldn’t.
A better adage is “Momentum is your friend”.
Just going balls out is no good but let’s say you’re going through a long rooty patch, if you have a little momentum going in, unweight the front a little and keep your heels down so that the bike doesn’t hang up under you if it hits something you’ll most likely get across.
If you hit the brakes in the same situation and try and pick your way through slowly chances are your weight will be forward, you wont have enough momentum, the bike will stall and you’ll come off. Most likely just a dab but I’ve seem many an over the bars in exactly that situation.
You’re trying to skip over stuff not barge your way through.