I'm not sure why people seem to think there isn't a level of growth that occurs for players of ALL ages that comes with playoff games.
NHL players don't just player reg season games to reach their growth potential as players, the playoffs are a totally different beast and right now this group has a whopping 3 awful games to their credit. EVERYONE on this roster needs exposure to playoff games and intensity. You're not going to sit back and asset management yourself into paralysis so these players don't have an opportunity to grow themselves towards the actual goal of winning a cup.
Panarin is in his 30s, zib and kreider will be shortly, shit on them all you want but they are 3 of the 5 best players on a top 3 team in the league just shy of the halfway mark. This team is built to start competing now and the kids that can contribute are going to step up and do so, the ones that lag behind will probably find themselves elsewhere by the summer of 23.