I saw something not long ago that seemed right, from a pro (lower league, USL maybe) player’s YT post. He said that you can get into top-level athletic condition with six months of hard work. You can’t develop elite ball skills, feel, etc in six months.
The main point was that at younger ages (10-14, primarily, I think), strength and speed training is a limited return investment. I have friends who spend money for their younger kids to speed train. I’ve seen the kids get faster, and that certainly helps on the pitch for our U12 squad, but there comes a time, you’re not going to win every race.
If I had lots of extra money to burn, it would be spent putting my kids in more playing sessions at unfamiliar environments with kids they don’t know.