Currently PSG is not a suitable team for talented young players like Lamine Yamal or Osimhen if they want to achieve a brilliant career. PSG are one of the top teams in Europe but they are almost never one of the favorites to win the UCL. They dominate Ligue 1 and almost every year qualify for the UCL. But Ligue 1 is not a league with high intensity and strong teams. A team with a very large cash capacity like PSG can bring in any player they want. But not all players need money, especially if they are young players. I think it would be wiser for young players to choose career over money.
I personaly would think the opposite to the opinion you are saying now, I think Lamine Yamal and Osimhen are indeed two talented young players and it would be better for them to play for PSG in the future, just like Mbappe before of course Lamine Yamal and Osimhen could make PSG a a stepping stone to achieving star player status in the future, so far PSG has played in Ligue 1, which in fact is a non-competitive league but is still included as one of the leagues included in the list of the top 5 European leagues, so in the absence of competitive competition of course making the opportunity for Lamine Yamal and Osimhen to become the center of attention of other big teams even greater in the future, so that Osimhen and Lamine Yamal can have a better opportunity to improve their careers in the future.
PSG is the only strongest team that has been able to dominate Ligue 1 so far because of their financial strength, so of course they will have a big chance of winning the Ligue 1 championship trophy and also qualifying for the Champions League every seasons, so far PSG has not been able to win the trophy champions league but that doesn't mean they are not a team that can't compete in the champions league, the journey to win the champions league is of course very difficult without the support of the mentality, performance and consistency of a team so far because of the tight competition, but that doesn't mean PSG doesn't have a chance to be able to get their first Champions League trophy and maybe Lamine Yamal and Osimhen will be part of PSG first UCL trophy winning squad in the future.