dave2008
Legend
EDIT since you cannot give examples from actual play, can you give a theoretical case where there would be a problem with BLESS boosting a BA threshold but where bardic dice or battlemaster dice would not - since at least one of thos is open and unaffected it seems?
No, I don't think there is such a situation. But we have neither a bard nor a battlemaster, so it wouldn't come up for us anyway. If we did I think this would be a less attractive proposal.
We are more concerned with magical effects stacking. We don't even have a character that can cast Bless! I only mentioned Bless because it was the first buff spell I could think of, I should have looked at equipment that stacks in the OP, but I was to lazy to look some up.
FYI, the group:
Elf Druid
Elf Fighter
Halfling Rogue
Lizardman Fighter / Wizard
Dragonborn Ranger / Fighter
Yuan-ti Warlock / Fighter
I don't have their character sheets so I am not sure of the level split.