SOMEONE DECIDES IF I PLAY???
Indoor encourages selection, while beach encourages inclusion.
Beach volleyball has no subs and non-invasive coaching (players must coach themselves during the game). Beach strategy also funnels all the balls to the person who has a weak skill (pass, set, hit, etc). This means players get more reps at the thing they need most. Also, means that the stronger players have to find ways to earn points (serve, set better, etc).
In order for me to hit in a game of indoor, someone needs to choose me to be on the court....someone must also decide that i play in the front row....and yet still someone must also choose whether to set me or the other front row hitter(s). 3 sets of decisions must go my way in order for me to hit a ball. That's pretty tough considering a coach can only watch 1 person at a time. Hope that i make a good player when coach is watching.
Imagine a group that always lifts up the weakest player...this makes the group stronger, overall. Getting the weak guy up to par, means he'll grow a lot. In indoor volleyball, the weakest player is often hidden...thus the weak player will not improve quickly (or at all).
Rep your weaknesses on the beach or hide them indoor.