Some modpacks contain mods with other means of long-range teleportation. In case of the modpack creator desiring to limit such features, usually it can be achieved by limiting crafting recipes or config.
In the opposite case of modpack creator desiring to enable such features, HexCasting suddenly falls behind due to the crippling downside of making a mess of dropped items not limited by any server configuration. This becomes even worse when multiple people are using the teleport either at the same time or in a short span of time.