I'd have to see some receipts around mechanical binding. Most alignment folks I know that like it, don't want those aspects back. I suppose OSR minded folks might for nostalgia reasons, but I'm not tuned into those folks. Are they in such a number to take notice?
Is it super often? Probably not, but I do see it from time to time- people who want mechanics in play for certain character classes to lose powers granted to them by a higher, uh, power, if they do something contrary to that entities' desires- which often comes down to alignment infractions for Clerics and Paladins.
This is a larger discussion though, since it also applies to Warlocks, who aren't usually paragons of virtue.
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I'm seeing lots of comments about reverting to "alignment as cosmic faction", which I have far less of a problem with than "alignment as ethical/moral code", but there still needs to be a reason to bother with it. For my adventurer who fights bandits and goblins in search of fortune or glory, why should I align myself to utter Law or Chaos, exactly?
Somewhat similar are settings that want players to choose patron deities, which, unless you're a Cleric (or sometimes a Druid or Paladin) does nothing for you, personally. Beyond that era in the Forgotten Realms where you were told to choose one or else suffer for eternity, of course.
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Forgive me for the segue, but this was always my issue with evil deities and those who serve them. If, in a D&D world, you know Gods are real, you can see their powers manifest by Clerics, and you know darned well that Asmodeus makes him home in a literal Hell, why would any sane person choose to worship an evil god?
I would think that, were an afterlife confirmed to exist, you'd want to make sure you got into one of the good ones...