Yeah and a GM thinking this is a minor consequence or in any way fun leads to the minor consequences that a player being harassed in this way will leave.
The player left, per the OP, because the DM refused to implement a house rule midgame.
That's a pretty thin reason. But we don't know the full story, backstory or context, so all we can do is go by what we have
How do you know that's plan B? If this was a typical warlock, we'd be seeing Eldritch Blast, but the player CHOSE true strike instead. Presumably because he's better in melee with it? Player CHOSE the crossbow for range, presumably as a tradeoff of some kind.Having to use a crossbow is already a plan B (which you kinda get for free at character creation). Being forced by the GM to have to use plan B (removing player agency) is already not fun. There is no choice in what you do because thats the only thing you can do to have any effect.
But this is not enough, this forced plan B with no player choice was made even more miserable by reducing the damage by 1/2 and by decreasing the hit chance by -20% which is almost 45% less hits. So your DPR outbut was reduced to almost 1/4th. So you are forced to do action X, which also really sucks.
This would not have been different without the phasing wrinkle. This is the way the PC does range, their CHOICE.
Also this removes in addition any options for bonus actions or reactions because you need both for this sad plan B. Also with a GM enforcing rules strictly, this maybe forces the player to use plan B on the other turns because "actually you can't draw your weapon for free for preparing an attack since thats not the attack action" or something like this.
At this point, why not just preroll the attacks for the player before and subtract the HP from the enemy, this saves at least time, if the players choice doesn't matter anyway.
This is an edge case, normally the PC just shoots the crossbow but with his to hit and damage being his casting stat, not quite as good as Eldridge blast at range, but close and the players choice. Presumably, he has other options somewhere else that he focused on instead.
And that's the real point. The player made some choices that made this edge case less than optimal for him (but presumably he rocks somewhere else).
When it came up, he didn't choose to discuss it after game - which the OP stated would have likely been fruitful. Instead he demanded immediate house ruling and quite when refused. That's what I'm focusing on.








