When under the effect of a beacon, any player has "potion" particles.
My feeling is those particles should not be displayed as they both reduce the visibility and do not give extra information to anybody.
Indeed, any player in range of a beacon will receive the effect and can safely assume any other players nearby also has it.

Please note how the situation is completely different from potions where particles is the only for a player to know if an opponent has any potion effect.
Also, as beacons tend to be used in bases, players are constantly under the effect, so they have those particles all the time.

Does my point of view make sense?

Best regards