Tablature is a wonderful thing, but too many people use it instead of learning the skills of listening and learning how to fit in with music. They don't try to develop ear skills, and those are more important than learning how to read from a printed page. Bluegrass banjo is not easily memorized, and in fact, good players typically do not memorize things exactly note for note. If a person only can read or memorize tablature, then they may be lost without it.
In real bluegrass playing, the musicians take note of the chord changes, and fit in with those as they also try to find melodies to use in their soloing. Most songs played are ones they've never tried to solo on previously. So they have to guess. Those with the most experience guessing do it the best and the most quickly. People who only play from tablature have no way to fit in unless they've perfectly memorized the song.
Once someone knows how to play, having developed ear skills, then tablature is something that can be used quickly and effectively to learn specifically how another player played a certain piece or part of interest. It's a great way to learn some of those details, exactly with no guesswork. Also, if a player makes something up that they really like, they might want to write a tab of it to help them remember it. So tablature can be quite useful.
But I encourage new players to use it very sparingly, so that they can develop ear skills.
I hope this helps!