Naturally, your mileage will vary when it comes to the HS soccer experience... much more so than even club because (obviously) clubs are more able to group players and teams by comparable skill/talent levels. So HS is simply more of a wild card in terms of quality and consistency. Yes, I saw plenty of teams that were just unskilled bruisers, and it worried me when our school played them. I also saw some really great soccer. My kid personally had an up and down experience in HS mainly due to the coach, eventually opting to forego Senior year, which ended up being a non-issue with Covid anyway. On the other hand, she had friends on the team who absolutely loved their HS experience. I learned it's best not to make blanket statements on HS soccer.
One thing that does not vary is that year-round soccer with little to no break between club and HS will take its toll on a player after 4 years one way or another, either physically or mentally. If your kid plans to do 4 years of club and 4 years of varsity HS soccer and possibly another 4 of college, you might invest in a cryochamber. Or just insist that there be 3 "down" months per calendar year to let their bodies completely recover (especially keepers) between seasons. Trust me on this. Don't think your kid is a special physical specimen and can take the constant beating. It's different than it was when they were littles. I saw this happen to sooo many of my kid's peers. When a young kid loves the sport as an 6-12 year old, they can literally play every single day of the year and never get hurt. You get to thinking that's how it will always be; they seem indestructible to us parent at that age. As those bodies get heavier from 14-17, the physical forces at play more than double because both mass and velocity are increasing. Remember Newtonian physics? It's no joke, and wear and tear isn't obvious until it's too late.
That said, I'm super happy to read about everyone's kids getting back on the pitch. Embrace it and enjoy it because we all know now how suddenly it can all be taken away.