I would think this is extremely important as it is often not obvious. Especially the fast lead sections that require special techniques (hammer-ons, pull-offs and picking style/direction) to be able to be played at 100% speed. You will usually start practicing at slow pace. Playing those sections slow maybe relatively doable, but at 100% speed you may find out that (guessed) wrong picking directions slow you down. If a song is difficult and you spent a long time memorizing the wrong picking directions, it takes a lot of time to 'unlearn' it. For many pieces I think that the picking direction is at least as important as the fingering. Just as some pieces are almost impossible to pull off without pull-offs (pun intended) and hammer-ons, likewise they may be impossible without applying the right picking directions. Even though some of the videos explicitly tell you which picking direction to use for the demonstrated patterns, it is far from obvious which of those patterns to apply in the actual songs. Personally the worst thing about this lacking feature, is the damage of learning something the wrong way and then having to unlearn it. Muscle memory is extremely important for a clean technique.

Hello, i'm a new player and i would love this feature. I find it hard to find the right choice of downpicking and uppicking. Then i unintentionally fall back to doing downpicks mostly. Please add this feature.

i like this idea

Just follow the principle - the picking that takes the least effort and that's the simplest possible is usually the best option. So, minimize the string skips and always try to advance to the direction where the next note is going to be picked. You'll get a hang of it in no time.

Pick direction

Add a visual indicator on each note of the pick direction it should be used to play it.

You can alternatively add it on the score. Or on both!