In Hades, if you look at the 'normal' boons list, there seems to be 22 slots (4 rows that alternate 5 or 6 slots).
Is that 22 limit a hard limit, and if you reach for your 23rd boon, what happens?
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Sign up to join this communityOK, so lets do some math.
If we believe the wiki: The elysium boss is room #36. So that means there are 36 rooms where you could get something the 6 styx doors.
So we get to 42.
So we would only need for the game to give no hammers or boons 6 times out of 28 possibilities (21%) and this can be curved if the player has a heavy boon start.
So knowing all that, I'm gonna go on a guess that the game stops you from getting more than 22 boons.