I coach in a USSA program and also lead the coaching for a Buddy Werner program with about 30 coaches, so I've seen lots of coaching styles/abilities and think a great deal about how to improve coaching--most of my Buddy Werner coaches are parent volunteers, with fewer than 10 even having their Level 100. I've definitely seen some coaches who just provide instruction on drills and fail to provide individualized feedback, especially among parent coaches, or coaches fresh off their college race team. One of the hardest things about coaching is looking at a racer and figuring out the root cause of what they're doing wrong and providing constructive feedback. Further, often times coaches have a group of 10 kids coming down the hill in rapid succession, and that group may vary from practice to practice, so it's hard to drill down on something specific with each racer, especially at the U10 level. So the easy thing to do is to provide generic feedback, or just repeat the drill focus.
But here's another big factor--is your child seeking feedback, and absorbing it? A typical coaching dynamic will be one coach at the bottom of a training course giving feedback, another at the top of the course getting kids started. Earlier this season, I'm at the top of the course, asking every kid, every run through "what are you working on?" A lot of kids shrug their shoulders, until I tell them I'm going to ask them Every. Single. Time. what they're working on, so they need to listen to the coach at the bottom and actually remember what feedback they're getting. Lo' and behold, kids started remembering, and because I asked them about it at the top of the course, they actually kind of sorta applied the feedback to the training.
At the U10 level, a lot of the kids are just having fun with their friends. They'll ski right past the coach at the bottom of the hill. Or during drills, they're spacing out, goofing off, or thinking about lunch. But then there's other kids that ask for feedback after every drill and every practice run. Then they come down the next run and tell the coach "I tried what you told me and XYZ happened..." They're engaged, and they progress very rapidly. That engagement requires a coach who is engaged as well, of course, but even a great coach needs the kid to put in effort. So, before you hire a instructor to do what the coach should be doing, maybe just encourage your child to ask for specific feedback from their coach. And keep at it. If I get asked by a kid two runs in a row how their run looked, and I don't have a good answer that shows I'm paying attention to their skiing, I'll be damned sure to be certain to have something to tell them on the third run, and that kid will stick out in my mind as someone who is pushing it. I'll look at their video, I'll think about them while I'm on the chair, while I'm driving to the hill, from week to week. Just food for thought.