But not all blockees are trolls, and not all blockers are using the block to fight trolls. Some may even be using it as a form of trolling themselves.
There isn't an easy way to differentiate an abusive blockee from an abusive blocker. If there were, it would make sense to provide additional incentivize against both anti-social behaviors. But there isn't.
Invisible posts are not a good thing for the health of the platform. It's not just blocker and blockee—everything is connected.
Say you have a very large account that blocks on a whim, accumulating many thousands of blocks, and regularly interacts with posts from other large accounts. That account has hurt the capacity to have meaningful interactions, not with it but with other accounts it interacts with, by eliding chunks of context from conversations for some portion of the community that was blocked on a whim.
Obviously, if that sort of attitude were to spread wide enough, then eventually having posts hidden would make the platform become noticeably worse.
It seems that some of the most vocal opponents of post visibility for blockees are precisely from accounts that block maliciously.
Worth mentioning that having a hair trigger is not necessarily malicious. But if a hair trigger blocker really cares that their posts are hidden, then they are most likely a malicious actor—Why else would they care if their posts are visible to the non-trolls they've blocked?