While it's good to be loaded in the starting lineup, there are some nuances:
1 - They have to sit down sometime. None of these guys are Wilt Chamberlain, and they can't play 48 minutes a night. As we've learned this season, the person who replaces them for 12 minutes is kind of important.
2 - They sometimes have to sit down in bunches. Foul trouble, getting winded, whatever... sometimes you need to sit three guys at a time. Our bench is so bad, so exceptionally dismal, that we can't have more than 1 of them in the game without our offense and defense suffering greatly. A bench with more than one competent player is more than kind of important now.
3 - They sometimes get injured. God forbid if we had to go with Nolan Smith or Will Barton starting for more than 1 game. A bench with competent players and one or two who could start a few games is really important.
In other words, you can have a perfectly good starting lineup (we're between 75 and 80% of the way there, imho), and still lose a ton of games because the bench can't hold a lead or step up in tough times. In most cases, getting a good starter is better than getting three good bench players. Ours is not that case; instead you could make the case that three good bench guys are an equal need to our one good starter. We have a project that needs to simmer in the one starting position we really need to fill, and a bench with exactly two NBA-level players... split out equally between five players. No player on our bench is NBA level, except maybe Maynor. Not to say they won't get better, but that may be a long way off.