I've always felt the same as you in that the SF position is very important. That is why right now I have two 20 year old SFs that will be on the U21 national team next season. It has been a clear struggle to train them out of position for 3 seasons but when they are 22-23 and I can play them at their natural position, they will be beasts that I can keep for 8+ seasons.
Murray/Harris/MPJ/Grant/Jokic - 2020 NBA Champs