Playing at a big club is inherently risky, and it's rare to get regular playing time until the coach truly trusts you. Hendrick might face the same problem as Rodrigo, but we can see Xabi Alonso also utilizing the abilities of young players to develop the team. If he has the option to join another team to maintain his chances of playing for the national team, it might be worth considering, but staying at Real Madrid at such a young age could also be very beneficial for Rodrigo.
What you say is true, as Xabi Alonso is a coach who rarely neglects young players, although he also favors players with experience at big clubs like Real Madrid. However, as for the two players you mentioned, I also think they would be very well served if they stayed at Real Madrid, as Xabi Alonso would certainly give them playing time, although we may not know if they would only play a few minutes after regular substitutions in any given match. Ultimately, however, young players like Rodrygo and Hendrick will never be wasted if they remain at Real Madrid next season.
Both Brazilian players are truly talented. I remember Endrick scoring a magnificent goal from outside the penalty area last year; he can't do that every month. If given enough opportunity, he could be a finishing striker for Real Madrid. He might have the potential to be as effective as the phenomenal Ronaldo. They might loan him out to another team for a year to show his potential, but he has the potential to become a key player for Real Madrid starting next year. As for Rodrygo, we all know how important he is to Real Madrid. If they want to let him go, they need a good alternative. In my opinion, he should stay with the team and continue to compete for another year.