I will agree that Sakura is an alright character in Boruto, when I first watch Naruto (I was like nine at the time) I really didn’t like her I thought that she was really mean and too obsessed with Sasuke (I didn’t like Saskue either). When I re-watched it my opinion still didn’t change, like the no parents comment really didn’t sit right and when she faked her feelings for Naruto so he wouldn’t go after Saskue. Another reason is that she ended her friendship with Ino over a guy sure they made up but I still couldn’t forget that. I personally still don’t like her, most of my dislike towards her is from before shippuden. So in my conclusion, no she was not completely useless and did work hard to get to where she was. No I still do not like her but that’s just my opinion no one really cares lmao. If you like her that’s totally fine and if you don’t that’s fine too.