2020 NFHS rule video.
In HS, most leagues today struggle getting ladies with any pitching instruction outside of season or, are willing to dedicate the time needed to actually pitch.
This year I have seen many games where the pitchers had no windmill, large kick back and looked more like slow pitch than fast pitch.
In summer league play the pitching rules are enforced more but the ladies also get private instruction. High school may have been impacted more with the year off and covid protocols this year also but there is a overall decline in pitching.
Those few that have it are generally undefeated in their league or have went on long winning streaks as a result.