The main complaint that I saw was Steph Curry being kept on a shorter leash and having his playing time reduced to 33.5 minutes a game. He was benched late in the fourth quarter a few times.
I don't know. I didn't watch many W's games, but I heard that there may have been some friction between Smart and Curry.
Steph Curry did publicly say he wanted his coach back next season for whatever that is worth.
I'm thinking the problem was more the ownership's view of Smart's handling of Curry rather than between Curry and Smart themselves. That they felt Curry wasn't been developed properly.
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I imagine they were also unsatisfied with their team's continued struggles defensively (26th in def eff) and on the backboards (last in the league, again!). Especially after they spent $80 million on David Lee (rebounds).
Oh, and GSW did improve by +5rpg in terms of rebounding differential. Still were the worst in the league (-4.3 per game) ... that is how bad they were they year before (-9.7 per game).
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There were also some complaints about Epke Udoh's role/minutes earlier in the year. Not sure if they lasted though. That the ownership wanted to see him on the court more. He did seem to get a fair bit of playing time, and several starts, to close the year. So that complaint might be outdated.