I think lethality is extremely DM dependent and it's hard to generalise across different games. The DM my group plays with has no issue killing off PCs, we're

I think lethality is extremely DM dependent and it's hard to generalise across different games. The DM my group plays with has no issue killing off PCs, we're level 4 and have had 3 deaths across our party of 4 so far. (Two for the same player!).