The plural of anecdote is not data. Every game that has random draws has this exact same story, and the answer is exactly the same for all of them: bad luck is just that...bad luck. Nobody is picking on anyone, there's no conspiracy to withhold good draws from any one person.

The mere existence of people in the game who have drawn 6* girls (of which I am not one, BTW) shows that there's nothing wrong with the gacha draws, they're just not as common as people would like them to be. I've received exactly three 5* girls in the gacha, and one of those was the guaranteed one everyone gets at the beginning so it's really only two. Being on the bad side of the bell curve of gacha draws happens sometimes. Out of the many people who play this game, having it happen repeatedly is also going to happen sometimes. People will post about their exceptionally bad luck, and people will post about their exceptionally good luck, but hardly anybody will post about their average luck (unless it's specifically to prove that average luck happens).

Regarding farming flower gems, however, I am a little concerned that after we use up the big boost given by clearing all the maps we'll have flower gems become too scarce to get a single 10+1 draw on every round of limited gachas they put up, let alone be able to use enough to get what we want from them. The weeks where we get all gems for login rewards will help, but having only event maps to gather new gems is going to make the supply tight. Also, 12-5 might not be the last of the regular campaigns, but we have no confirmation on that as of yet. The only answer to a string of bad luck is more attempts, and they seem to want Nutaku gold to be the only way to break free of it.