Is this really that different than any other year?
LeBron, Lonzo, Ingram all sat out the Lakers stretch run while Olapipo missed the playoffs and Blake Griffin sat out the final 2 playoff games for their teams last year.
Obviously the Nets is a little more extreme, but you have teams like the Clippers ('16) missing Blake and Chris Paul by the end of their 1st round run, and the Rockets ('09) missing both Yao and McGrady by the end of their 2nd round run.
And I'm sure there's been other teams in recent history limping to the playoffs with depleted rosters. (One seemingly random not-so-recent team that comes to mind is the '94 Cavs, missing Nance and Daugherty, both All-Stars the prior year, and Hot Rod Williams, a solid starter, getting swept by a Jordan-less Bulls).
So far this just feels like a couple of teams hit hard by the injury bug and/or sitting out players when they don't have a shot, which happens all the time.
Will admit though, we're teetering on the edge of going well past that point, but so far it still feels like a somewhat normal playoff run in terms of player availability to me.